/*!
 * Vue.js v2.4.0
 * (c) 2014-2017 Evan You
 * Released under the MIT License.
 */
(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
    typeof define === 'function' && define.amd ? define(factory) :
    (global.Vue = factory());
 }(this, (function () { 'use strict';
 
 /*  */
 
 // these helpers produces better vm code in JS engines due to their
 // explicitness and function inlining
 function isUndef (v) {
   return v === undefined || v === null
 }
 
 function isDef (v) {
   return v !== undefined && v !== null
 }
 
 function isTrue (v) {
   return v === true
 }
 
 function isFalse (v) {
   return v === false
 }
 
 /**
  * Check if value is primitive
  */
 function isPrimitive (value) {
   return typeof value === 'string' || typeof value === 'number'
 }
 
 /**
  * Quick object check - this is primarily used to tell
  * Objects from primitive values when we know the value
  * is a JSON-compliant type.
  */
 function isObject (obj) {
   return obj !== null && typeof obj === 'object'
 }
 
 var _toString = Object.prototype.toString;
 
 /**
  * Strict object type check. Only returns true
  * for plain JavaScript objects.
  */
 function isPlainObject (obj) {
   return _toString.call(obj) === '[object Object]'
 }
 
 function isRegExp (v) {
   return _toString.call(v) === '[object RegExp]'
 }
 
 /**
  * Check if val is a valid array index.
  */
 function isValidArrayIndex (val) {
   var n = parseFloat(val);
   return n >= 0 && Math.floor(n) === n && isFinite(val)
 }
 
 /**
  * Convert a value to a string that is actually rendered.
  */
 function toString (val) {
   return val == null
     ? ''
     : typeof val === 'object'
       ? JSON.stringify(val, null, 2)
       : String(val)
 }
 
 /**
  * Convert a input value to a number for persistence.
  * If the conversion fails, return original string.
  */
 function toNumber (val) {
   var n = parseFloat(val);
   return isNaN(n) ? val : n
 }
 
 /**
  * Make a map and return a function for checking if a key
  * is in that map.
  */
 function makeMap (
   str,
   expectsLowerCase
 ) {
   var map = Object.create(null);
   var list = str.split(',');
   for (var i = 0; i < list.length; i++) {
     map[list[i]] = true;
   }
   return expectsLowerCase
     ? function (val) { return map[val.toLowerCase()]; }
     : function (val) { return map[val]; }
 }
 
 /**
  * Check if a tag is a built-in tag.
  */
 var isBuiltInTag = makeMap('slot,component', true);
 
 /**
  * Check if a attribute is a reserved attribute.
  */
 var isReservedAttribute = makeMap('key,ref,slot,is');
 
 /**
  * Remove an item from an array
  */
 function remove (arr, item) {
   if (arr.length) {
     var index = arr.indexOf(item);
     if (index > -1) {
       return arr.splice(index, 1)
     }
   }
 }
 
 /**
  * Check whether the object has the property.
  */
 var hasOwnProperty = Object.prototype.hasOwnProperty;
 function hasOwn (obj, key) {
   return hasOwnProperty.call(obj, key)
 }
 
 /**
  * Create a cached version of a pure function.
  */
 function cached (fn) {
   var cache = Object.create(null);
   return (function cachedFn (str) {
     var hit = cache[str];
     return hit || (cache[str] = fn(str))
   })
 }
 
 /**
  * Camelize a hyphen-delimited string.
  */
 var camelizeRE = /-(\w)/g;
 var camelize = cached(function (str) {
   return str.replace(camelizeRE, function (_, c) { return c ? c.toUpperCase() : ''; })
 });
 
 /**
  * Capitalize a string.
  */
 var capitalize = cached(function (str) {
   return str.charAt(0).toUpperCase() + str.slice(1)
 });
 
 /**
  * Hyphenate a camelCase string.
  */
 var hyphenateRE = /([^-])([A-Z])/g;
 var hyphenate = cached(function (str) {
   return str
     .replace(hyphenateRE, '$1-$2')
     .replace(hyphenateRE, '$1-$2')
     .toLowerCase()
 });
 
 /**
  * Simple bind, faster than native
  */
 function bind (fn, ctx) {
   function boundFn (a) {
     var l = arguments.length;
     return l
       ? l > 1
         ? fn.apply(ctx, arguments)
         : fn.call(ctx, a)
       : fn.call(ctx)
   }
   // record original fn length
   boundFn._length = fn.length;
   return boundFn
 }
 
 /**
  * Convert an Array-like object to a real Array.
  */
 function toArray (list, start) {
   start = start || 0;
   var i = list.length - start;
   var ret = new Array(i);
   while (i--) {
     ret[i] = list[i + start];
   }
   return ret
 }
 
 /**
  * Mix properties into target object.
  */
 function extend (to, _from) {
   for (var key in _from) {
     to[key] = _from[key];
   }
   return to
 }
 
 /**
  * Merge an Array of Objects into a single Object.
  */
 function toObject (arr) {
   var res = {};
   for (var i = 0; i < arr.length; i++) {
     if (arr[i]) {
       extend(res, arr[i]);
     }
   }
   return res
 }
 
 /**
  * Perform no operation.
  * Stubbing args to make Flow happy without leaving useless transpiled code
  * with ...rest (https://flow.org/blog/2017/05/07/Strict-Function-Call-Arity/)
  */
 function noop (a, b, c) {}
 
 /**
  * Always return false.
  */
 var no = function (a, b, c) { return false; };
 
 /**
  * Return same value
  */
 var identity = function (_) { return _; };
 
 /**
  * Generate a static keys string from compiler modules.
  */
 function genStaticKeys (modules) {
   return modules.reduce(function (keys, m) {
     return keys.concat(m.staticKeys || [])
   }, []).join(',')
 }
 
 /**
  * Check if two values are loosely equal - that is,
  * if they are plain objects, do they have the same shape?
  */
 function looseEqual (a, b) {
   var isObjectA = isObject(a);
   var isObjectB = isObject(b);
   if (isObjectA && isObjectB) {
     try {
       return JSON.stringify(a) === JSON.stringify(b)
     } catch (e) {
       // possible circular reference
       return a === b
     }
   } else if (!isObjectA && !isObjectB) {
     return String(a) === String(b)
   } else {
     return false
   }
 }
 
 function looseIndexOf (arr, val) {
   for (var i = 0; i < arr.length; i++) {
     if (looseEqual(arr[i], val)) { return i }
   }
   return -1
 }
 
 /**
  * Ensure a function is called only once.
  */
 function once (fn) {
   var called = false;
   return function () {
     if (!called) {
       called = true;
       fn.apply(this, arguments);
     }
   }
 }
 
 var SSR_ATTR = 'data-server-rendered';
 
 var ASSET_TYPES = [
   'component',
   'directive',
   'filter'
 ];
 
 var LIFECYCLE_HOOKS = [
   'beforeCreate',
   'created',
   'beforeMount',
   'mounted',
   'beforeUpdate',
   'updated',
   'beforeDestroy',
   'destroyed',
   'activated',
   'deactivated'
 ];
 
 /*  */
 
 var config = ({
   /**
    * Option merge strategies (used in core/util/options)
    */
   optionMergeStrategies: Object.create(null),
 
   /**
    * Whether to suppress warnings.
    */
   silent: false,
 
   /**
    * Show production mode tip message on boot?
    */
   productionTip: "development" !== 'production',
 
   /**
    * Whether to enable devtools
    */
   devtools: "development" !== 'production',
 
   /**
    * Whether to record perf
    */
   performance: false,
 
   /**
    * Error handler for watcher errors
    */
   errorHandler: null,
 
   /**
    * Warn handler for watcher warns
    */
   warnHandler: null,
 
   /**
    * Ignore certain custom elements
    */
   ignoredElements: [],
 
   /**
    * Custom user key aliases for v-on
    */
   keyCodes: Object.create(null),
 
   /**
    * Check if a tag is reserved so that it cannot be registered as a
    * component. This is platform-dependent and may be overwritten.
    */
   isReservedTag: no,
 
   /**
    * Check if an attribute is reserved so that it cannot be used as a component
    * prop. This is platform-dependent and may be overwritten.
    */
   isReservedAttr: no,
 
   /**
    * Check if a tag is an unknown element.
    * Platform-dependent.
    */
   isUnknownElement: no,
 
   /**
    * Get the namespace of an element
    */
   getTagNamespace: noop,
 
   /**
    * Parse the real tag name for the specific platform.
    */
   parsePlatformTagName: identity,
 
   /**
    * Check if an attribute must be bound using property, e.g. value
    * Platform-dependent.
    */
   mustUseProp: no,
 
   /**
    * Exposed for legacy reasons
    */
   _lifecycleHooks: LIFECYCLE_HOOKS
 });
 
 /*  */
 
 var emptyObject = Object.freeze({});
 
 /**
  * Check if a string starts with $ or _
  */
 function isReserved (str) {
   var c = (str + '').charCodeAt(0);
   return c === 0x24 || c === 0x5F
 }
 
 /**
  * Define a property.
  */
 function def (obj, key, val, enumerable) {
   Object.defineProperty(obj, key, {
     value: val,
     enumerable: !!enumerable,
     writable: true,
     configurable: true
   });
 }
 
 /**
  * Parse simple path.
  */
 var bailRE = /[^\w.$]/;
 function parsePath (path) {
   if (bailRE.test(path)) {
     return
   }
   var segments = path.split('.');
   return function (obj) {
     for (var i = 0; i < segments.length; i++) {
       if (!obj) { return }
       obj = obj[segments[i]];
     }
     return obj
   }
 }
 
 /*  */
 
 var warn = noop;
 var tip = noop;
 var formatComponentName = (null); // work around flow check
 
 {
   var hasConsole = typeof console !== 'undefined';
   var classifyRE = /(?:^|[-_])(\w)/g;
   var classify = function (str) { return str
     .replace(classifyRE, function (c) { return c.toUpperCase(); })
     .replace(/[-_]/g, ''); };
 
   warn = function (msg, vm) {
     var trace = vm ? generateComponentTrace(vm) : '';
 
     if (config.warnHandler) {
       config.warnHandler.call(null, msg, vm, trace);
     } else if (hasConsole && (!config.silent)) {
       console.error(("[Vue warn]: " + msg + trace));
     }
   };
 
   tip = function (msg, vm) {
     if (hasConsole && (!config.silent)) {
       console.warn("[Vue tip]: " + msg + (
         vm ? generateComponentTrace(vm) : ''
       ));
     }
   };
 
   formatComponentName = function (vm, includeFile) {
     if (vm.$root === vm) {
       return '<Root>'
     }
     var name = typeof vm === 'string'
       ? vm
       : typeof vm === 'function' && vm.options
         ? vm.options.name
         : vm._isVue
           ? vm.$options.name || vm.$options._componentTag
           : vm.name;
 
     var file = vm._isVue && vm.$options.__file;
     if (!name && file) {
       var match = file.match(/([^/\\]+)\.vue$/);
       name = match && match[1];
     }
 
     return (
       (name ? ("<" + (classify(name)) + ">") : "<Anonymous>") +
       (file && includeFile !== false ? (" at " + file) : '')
     )
   };
 
   var repeat = function (str, n) {
     var res = '';
     while (n) {
       if (n % 2 === 1) { res += str; }
       if (n > 1) { str += str; }
       n >>= 1;
     }
     return res
   };
 
   var generateComponentTrace = function (vm) {
     if (vm._isVue && vm.$parent) {
       var tree = [];
       var currentRecursiveSequence = 0;
       while (vm) {
         if (tree.length > 0) {
           var last = tree[tree.length - 1];
           if (last.constructor === vm.constructor) {
             currentRecursiveSequence++;
             vm = vm.$parent;
             continue
           } else if (currentRecursiveSequence > 0) {
             tree[tree.length - 1] = [last, currentRecursiveSequence];
             currentRecursiveSequence = 0;
           }
         }
         tree.push(vm);
         vm = vm.$parent;
       }
       return '\n\nfound in\n\n' + tree
         .map(function (vm, i) { return ("" + (i === 0 ? '---> ' : repeat(' ', 5 + i * 2)) + (Array.isArray(vm)
             ? ((formatComponentName(vm[0])) + "... (" + (vm[1]) + " recursive calls)")
             : formatComponentName(vm))); })
         .join('\n')
     } else {
       return ("\n\n(found in " + (formatComponentName(vm)) + ")")
     }
   };
 }
 
 /*  */
 
 function handleError (err, vm, info) {
   if (config.errorHandler) {
     config.errorHandler.call(null, err, vm, info);
   } else {
     {
       warn(("Error in " + info + ": \"" + (err.toString()) + "\""), vm);
     }
     /* istanbul ignore else */
     if (inBrowser && typeof console !== 'undefined') {
       console.error(err);
     } else {
       throw err
     }
   }
 }
 
 /*  */
 /* globals MutationObserver */
 
 // can we use __proto__?
 var hasProto = '__proto__' in {};
 
 // Browser environment sniffing
 var inBrowser = typeof window !== 'undefined';
 var UA = inBrowser && window.navigator.userAgent.toLowerCase();
 var isIE = UA && /msie|trident/.test(UA);
 var isIE9 = UA && UA.indexOf('msie 9.0') > 0;
 var isEdge = UA && UA.indexOf('edge/') > 0;
 var isAndroid = UA && UA.indexOf('android') > 0;
 var isIOS = UA && /iphone|ipad|ipod|ios/.test(UA);
 var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;
 
 // Firefix has a "watch" function on Object.prototype...
 var nativeWatch = ({}).watch;
 
 var supportsPassive = false;
 if (inBrowser) {
   try {
     var opts = {};
     Object.defineProperty(opts, 'passive', ({
       get: function get () {
         /* istanbul ignore next */
         supportsPassive = true;
       }
     })); // https://github.com/facebook/flow/issues/285
     window.addEventListener('test-passive', null, opts);
   } catch (e) {}
 }
 
 // this needs to be lazy-evaled because vue may be required before
 // vue-server-renderer can set VUE_ENV
 var _isServer;
 var isServerRendering = function () {
   if (_isServer === undefined) {
     /* istanbul ignore if */
     if (!inBrowser && typeof global !== 'undefined') {
       // detect presence of vue-server-renderer and avoid
       // Webpack shimming the process
       _isServer = global['process'].env.VUE_ENV === 'server';
     } else {
       _isServer = false;
     }
   }
   return _isServer
 };
 
 // detect devtools
 var devtools = inBrowser && window.__VUE_DEVTOOLS_GLOBAL_HOOK__;
 
 /* istanbul ignore next */
 function isNative (Ctor) {
   return typeof Ctor === 'function' && /native code/.test(Ctor.toString())
 }
 
 var hasSymbol =
   typeof Symbol !== 'undefined' && isNative(Symbol) &&
   typeof Reflect !== 'undefined' && isNative(Reflect.ownKeys);
 
 /**
  * Defer a task to execute it asynchronously.
  */
 var nextTick = (function () {
   var callbacks = [];
   var pending = false;
   var timerFunc;
 
   function nextTickHandler () {
     pending = false;
     var copies = callbacks.slice(0);
     callbacks.length = 0;
     for (var i = 0; i < copies.length; i++) {
       copies[i]();
     }
   }
 
   // the nextTick behavior leverages the microtask queue, which can be accessed
   // via either native Promise.then or MutationObserver.
   // MutationObserver has wider support, however it is seriously bugged in
   // UIWebView in iOS >= 9.3.3 when triggered in touch event handlers. It
   // completely stops working after triggering a few times... so, if native
   // Promise is available, we will use it:
   /* istanbul ignore if */
   if (typeof Promise !== 'undefined' && isNative(Promise)) {
     var p = Promise.resolve();
     var logError = function (err) { console.error(err); };
     timerFunc = function () {
       p.then(nextTickHandler).catch(logError);
       // in problematic UIWebViews, Promise.then doesn't completely break, but
       // it can get stuck in a weird state where callbacks are pushed into the
       // microtask queue but the queue isn't being flushed, until the browser
       // needs to do some other work, e.g. handle a timer. Therefore we can
       // "force" the microtask queue to be flushed by adding an empty timer.
       if (isIOS) { setTimeout(noop); }
     };
   } else if (typeof MutationObserver !== 'undefined' && (
     isNative(MutationObserver) ||
     // PhantomJS and iOS 7.x
     MutationObserver.toString() === '[object MutationObserverConstructor]'
   )) {
     // use MutationObserver where native Promise is not available,
     // e.g. PhantomJS IE11, iOS7, Android 4.4
     var counter = 1;
     var observer = new MutationObserver(nextTickHandler);
     var textNode = document.createTextNode(String(counter));
     observer.observe(textNode, {
       characterData: true
     });
     timerFunc = function () {
       counter = (counter + 1) % 2;
       textNode.data = String(counter);
     };
   } else {
     // fallback to setTimeout
     /* istanbul ignore next */
     timerFunc = function () {
       setTimeout(nextTickHandler, 0);
     };
   }
 
   return function queueNextTick (cb, ctx) {
     var _resolve;
     callbacks.push(function () {
       if (cb) {
         try {
           cb.call(ctx);
         } catch (e) {
           handleError(e, ctx, 'nextTick');
         }
       } else if (_resolve) {
         _resolve(ctx);
       }
     });
     if (!pending) {
       pending = true;
       timerFunc();
     }
     if (!cb && typeof Promise !== 'undefined') {
       return new Promise(function (resolve, reject) {
         _resolve = resolve;
       })
     }
   }
 })();
 
 var _Set;
 /* istanbul ignore if */
 if (typeof Set !== 'undefined' && isNative(Set)) {
   // use native Set when available.
   _Set = Set;
 } else {
   // a non-standard Set polyfill that only works with primitive keys.
   _Set = (function () {
     function Set () {
       this.set = Object.create(null);
     }
     Set.prototype.has = function has (key) {
       return this.set[key] === true
     };
     Set.prototype.add = function add (key) {
       this.set[key] = true;
     };
     Set.prototype.clear = function clear () {
       this.set = Object.create(null);
     };
 
     return Set;
   }());
 }
 
 /*  */
 
 
 var uid = 0;
 
 /**
  * A dep is an observable that can have multiple
  * directives subscribing to it.
  */
 var Dep = function Dep () {
   this.id = uid++;
   this.subs = [];
 };
 
 Dep.prototype.addSub = function addSub (sub) {
   this.subs.push(sub);
 };
 
 Dep.prototype.removeSub = function removeSub (sub) {
   remove(this.subs, sub);
 };
 
 Dep.prototype.depend = function depend () {
   if (Dep.target) {
     Dep.target.addDep(this);
   }
 };
 
 Dep.prototype.notify = function notify () {
   // stabilize the subscriber list first
   var subs = this.subs.slice();
   for (var i = 0, l = subs.length; i < l; i++) {
     subs[i].update();
   }
 };
 
 // the current target watcher being evaluated.
 // this is globally unique because there could be only one
 // watcher being evaluated at any time.
 Dep.target = null;
 var targetStack = [];
 
 function pushTarget (_target) {
   if (Dep.target) { targetStack.push(Dep.target); }
   Dep.target = _target;
 }
 
 function popTarget () {
   Dep.target = targetStack.pop();
 }
 
 /*
  * not type checking this file because flow doesn't play well with
  * dynamically accessing methods on Array prototype
  */
 
 var arrayProto = Array.prototype;
 var arrayMethods = Object.create(arrayProto);[
   'push',
   'pop',
   'shift',
   'unshift',
   'splice',
   'sort',
   'reverse'
 ]
 .forEach(function (method) {
   // cache original method
   var original = arrayProto[method];
   def(arrayMethods, method, function mutator () {
     var args = [], len = arguments.length;
     while ( len-- ) args[ len ] = arguments[ len ];
 
     var result = original.apply(this, args);
     var ob = this.__ob__;
     var inserted;
     switch (method) {
       case 'push':
       case 'unshift':
         inserted = args;
         break
       case 'splice':
         inserted = args.slice(2);
         break
     }
     if (inserted) { ob.observeArray(inserted); }
     // notify change
     ob.dep.notify();
     return result
   });
 });
 
 /*  */
 
 var arrayKeys = Object.getOwnPropertyNames(arrayMethods);
 
 /**
  * By default, when a reactive property is set, the new value is
  * also converted to become reactive. However when passing down props,
  * we don't want to force conversion because the value may be a nested value
  * under a frozen data structure. Converting it would defeat the optimization.
  */
 var observerState = {
   shouldConvert: true
 };
 
 /**
  * Observer class that are attached to each observed
  * object. Once attached, the observer converts target
  * object's property keys into getter/setters that
  * collect dependencies and dispatches updates.
  */
 var Observer = function Observer (value) {
   this.value = value;
   this.dep = new Dep();
   this.vmCount = 0;
   def(value, '__ob__', this);
   if (Array.isArray(value)) {
     var augment = hasProto
       ? protoAugment
       : copyAugment;
     augment(value, arrayMethods, arrayKeys);
     this.observeArray(value);
   } else {
     this.walk(value);
   }
 };
 
 /**
  * Walk through each property and convert them into
  * getter/setters. This method should only be called when
  * value type is Object.
  */
 Observer.prototype.walk = function walk (obj) {
   var keys = Object.keys(obj);
   for (var i = 0; i < keys.length; i++) {
     defineReactive$$1(obj, keys[i], obj[keys[i]]);
   }
 };
 
 /**
  * Observe a list of Array items.
  */
 Observer.prototype.observeArray = function observeArray (items) {
   for (var i = 0, l = items.length; i < l; i++) {
     observe(items[i]);
   }
 };
 
 // helpers
 
 /**
  * Augment an target Object or Array by intercepting
  * the prototype chain using __proto__
  */
 function protoAugment (target, src, keys) {
   /* eslint-disable no-proto */
   target.__proto__ = src;
   /* eslint-enable no-proto */
 }
 
 /**
  * Augment an target Object or Array by defining
  * hidden properties.
  */
 /* istanbul ignore next */
 function copyAugment (target, src, keys) {
   for (var i = 0, l = keys.length; i < l; i++) {
     var key = keys[i];
     def(target, key, src[key]);
   }
 }
 
 /**
  * Attempt to create an observer instance for a value,
  * returns the new observer if successfully observed,
  * or the existing observer if the value already has one.
  */
 function observe (value, asRootData) {
   if (!isObject(value)) {
     return
   }
   var ob;
   if (hasOwn(value, '__ob__') && value.__ob__ instanceof Observer) {
     ob = value.__ob__;
   } else if (
     observerState.shouldConvert &&
     !isServerRendering() &&
     (Array.isArray(value) || isPlainObject(value)) &&
     Object.isExtensible(value) &&
     !value._isVue
   ) {
     ob = new Observer(value);
   }
   if (asRootData && ob) {
     ob.vmCount++;
   }
   return ob
 }
 
 /**
  * Define a reactive property on an Object.
  */
 function defineReactive$$1 (
   obj,
   key,
   val,
   customSetter,
   shallow
 ) {
   var dep = new Dep();
 
   var property = Object.getOwnPropertyDescriptor(obj, key);
   if (property && property.configurable === false) {
     return
   }
 
   // cater for pre-defined getter/setters
   var getter = property && property.get;
   var setter = property && property.set;
 
   var childOb = !shallow && observe(val);
   Object.defineProperty(obj, key, {
     enumerable: true,
     configurable: true,
     get: function reactiveGetter () {
       var value = getter ? getter.call(obj) : val;
       if (Dep.target) {
         dep.depend();
         if (childOb) {
           childOb.dep.depend();
         }
         if (Array.isArray(value)) {
           dependArray(value);
         }
       }
       return value
     },
     set: function reactiveSetter (newVal) {
       var value = getter ? getter.call(obj) : val;
       /* eslint-disable no-self-compare */
       if (newVal === value || (newVal !== newVal && value !== value)) {
         return
       }
       /* eslint-enable no-self-compare */
       if ("development" !== 'production' && customSetter) {
         customSetter();
       }
       if (setter) {
         setter.call(obj, newVal);
       } else {
         val = newVal;
       }
       childOb = !shallow && observe(newVal);
       dep.notify();
     }
   });
 }
 
 /**
  * Set a property on an object. Adds the new property and
  * triggers change notification if the property doesn't
  * already exist.
  */
 function set (target, key, val) {
   if (Array.isArray(target) && isValidArrayIndex(key)) {
     target.length = Math.max(target.length, key);
     target.splice(key, 1, val);
     return val
   }
   if (hasOwn(target, key)) {
     target[key] = val;
     return val
   }
   var ob = (target).__ob__;
   if (target._isVue || (ob && ob.vmCount)) {
     "development" !== 'production' && warn(
       'Avoid adding reactive properties to a Vue instance or its root $data ' +
       'at runtime - declare it upfront in the data option.'
     );
     return val
   }
   if (!ob) {
     target[key] = val;
     return val
   }
   defineReactive$$1(ob.value, key, val);
   ob.dep.notify();
   return val
 }
 
 /**
  * Delete a property and trigger change if necessary.
  */
 function del (target, key) {
   if (Array.isArray(target) && isValidArrayIndex(key)) {
     target.splice(key, 1);
     return
   }
   var ob = (target).__ob__;
   if (target._isVue || (ob && ob.vmCount)) {
     "development" !== 'production' && warn(
       'Avoid deleting properties on a Vue instance or its root $data ' +
       '- just set it to null.'
     );
     return
   }
   if (!hasOwn(target, key)) {
     return
   }
   delete target[key];
   if (!ob) {
     return
   }
   ob.dep.notify();
 }
 
 /**
  * Collect dependencies on array elements when the array is touched, since
  * we cannot intercept array element access like property getters.
  */
 function dependArray (value) {
   for (var e = (void 0), i = 0, l = value.length; i < l; i++) {
     e = value[i];
     e && e.__ob__ && e.__ob__.dep.depend();
     if (Array.isArray(e)) {
       dependArray(e);
     }
   }
 }
 
 /*  */
 
 /**
  * Option overwriting strategies are functions that handle
  * how to merge a parent option value and a child option
  * value into the final value.
  */
 var strats = config.optionMergeStrategies;
 
 /**
  * Options with restrictions
  */
 {
   strats.el = strats.propsData = function (parent, child, vm, key) {
     if (!vm) {
       warn(
         "option \"" + key + "\" can only be used during instance " +
         'creation with the `new` keyword.'
       );
     }
     return defaultStrat(parent, child)
   };
 }
 
 /**
  * Helper that recursively merges two data objects together.
  */
 function mergeData (to, from) {
   if (!from) { return to }
   var key, toVal, fromVal;
   var keys = Object.keys(from);
   for (var i = 0; i < keys.length; i++) {
     key = keys[i];
     toVal = to[key];
     fromVal = from[key];
     if (!hasOwn(to, key)) {
       set(to, key, fromVal);
     } else if (isPlainObject(toVal) && isPlainObject(fromVal)) {
       mergeData(toVal, fromVal);
     }
   }
   return to
 }
 
 /**
  * Data
  */
 function mergeDataOrFn (
   parentVal,
   childVal,
   vm
 ) {
   if (!vm) {
     // in a Vue.extend merge, both should be functions
     if (!childVal) {
       return parentVal
     }
     if (!parentVal) {
       return childVal
     }
     // when parentVal & childVal are both present,
     // we need to return a function that returns the
     // merged result of both functions... no need to
     // check if parentVal is a function here because
     // it has to be a function to pass previous merges.
     return function mergedDataFn () {
       return mergeData(
         typeof childVal === 'function' ? childVal.call(this) : childVal,
         parentVal.call(this)
       )
     }
   } else if (parentVal || childVal) {
     return function mergedInstanceDataFn () {
       // instance merge
       var instanceData = typeof childVal === 'function'
         ? childVal.call(vm)
         : childVal;
       var defaultData = typeof parentVal === 'function'
         ? parentVal.call(vm)
         : undefined;
       if (instanceData) {
         return mergeData(instanceData, defaultData)
       } else {
         return defaultData
       }
     }
   }
 }
 
 strats.data = function (
   parentVal,
   childVal,
   vm
 ) {
   if (!vm) {
     if (childVal && typeof childVal !== 'function') {
       "development" !== 'production' && warn(
         'The "data" option should be a function ' +
         'that returns a per-instance value in component ' +
         'definitions.',
         vm
       );
 
       return parentVal
     }
     return mergeDataOrFn.call(this, parentVal, childVal)
   }
 
   return mergeDataOrFn(parentVal, childVal, vm)
 };
 
 /**
  * Hooks and props are merged as arrays.
  */
 function mergeHook (
   parentVal,
   childVal
 ) {
   return childVal
     ? parentVal
       ? parentVal.concat(childVal)
       : Array.isArray(childVal)
         ? childVal
         : [childVal]
     : parentVal
 }
 
 LIFECYCLE_HOOKS.forEach(function (hook) {
   strats[hook] = mergeHook;
 });
 
 /**
  * Assets
  *
  * When a vm is present (instance creation), we need to do
  * a three-way merge between constructor options, instance
  * options and parent options.
  */
 function mergeAssets (parentVal, childVal) {
   var res = Object.create(parentVal || null);
   return childVal
     ? extend(res, childVal)
     : res
 }
 
 ASSET_TYPES.forEach(function (type) {
   strats[type + 's'] = mergeAssets;
 });
 
 /**
  * Watchers.
  *
  * Watchers hashes should not overwrite one
  * another, so we merge them as arrays.
  */
 strats.watch = function (parentVal, childVal) {
   // work around Firefox's Object.prototype.watch...
   if (parentVal === nativeWatch) { parentVal = undefined; }
   if (childVal === nativeWatch) { childVal = undefined; }
   /* istanbul ignore if */
   if (!childVal) { return Object.create(parentVal || null) }
   if (!parentVal) { return childVal }
   var ret = {};
   extend(ret, parentVal);
   for (var key in childVal) {
     var parent = ret[key];
     var child = childVal[key];
     if (parent && !Array.isArray(parent)) {
       parent = [parent];
     }
     ret[key] = parent
       ? parent.concat(child)
       : Array.isArray(child) ? child : [child];
   }
   return ret
 };
 
 /**
  * Other object hashes.
  */
 strats.props =
 strats.methods =
 strats.inject =
 strats.computed = function (parentVal, childVal) {
   if (!childVal) { return Object.create(parentVal || null) }
   if (!parentVal) { return childVal }
   var ret = Object.create(null);
   extend(ret, parentVal);
   extend(ret, childVal);
   return ret
 };
 strats.provide = mergeDataOrFn;
 
 /**
  * Default strategy.
  */
 var defaultStrat = function (parentVal, childVal) {
   return childVal === undefined
     ? parentVal
     : childVal
 };
 
 /**
  * Validate component names
  */
 function checkComponents (options) {
   for (var key in options.components) {
     var lower = key.toLowerCase();
     if (isBuiltInTag(lower) || config.isReservedTag(lower)) {
       warn(
         'Do not use built-in or reserved HTML elements as component ' +
         'id: ' + key
       );
     }
   }
 }
 
 /**
  * Ensure all props option syntax are normalized into the
  * Object-based format.
  */
 function normalizeProps (options) {
   var props = options.props;
   if (!props) { return }
   var res = {};
   var i, val, name;
   if (Array.isArray(props)) {
     i = props.length;
     while (i--) {
       val = props[i];
       if (typeof val === 'string') {
         name = camelize(val);
         res[name] = { type: null };
       } else {
         warn('props must be strings when using array syntax.');
       }
     }
   } else if (isPlainObject(props)) {
     for (var key in props) {
       val = props[key];
       name = camelize(key);
       res[name] = isPlainObject(val)
         ? val
         : { type: val };
     }
   }
   options.props = res;
 }
 
 /**
  * Normalize all injections into Object-based format
  */
 function normalizeInject (options) {
   var inject = options.inject;
   if (Array.isArray(inject)) {
     var normalized = options.inject = {};
     for (var i = 0; i < inject.length; i++) {
       normalized[inject[i]] = inject[i];
     }
   }
 }
 
 /**
  * Normalize raw function directives into object format.
  */
 function normalizeDirectives (options) {
   var dirs = options.directives;
   if (dirs) {
     for (var key in dirs) {
       var def = dirs[key];
       if (typeof def === 'function') {
         dirs[key] = { bind: def, update: def };
       }
     }
   }
 }
 
 /**
  * Merge two option objects into a new one.
  * Core utility used in both instantiation and inheritance.
  */
 function mergeOptions (
   parent,
   child,
   vm
 ) {
   {
     checkComponents(child);
   }
 
   if (typeof child === 'function') {
     child = child.options;
   }
 
   normalizeProps(child);
   normalizeInject(child);
   normalizeDirectives(child);
   var extendsFrom = child.extends;
   if (extendsFrom) {
     parent = mergeOptions(parent, extendsFrom, vm);
   }
   if (child.mixins) {
     for (var i = 0, l = child.mixins.length; i < l; i++) {
       parent = mergeOptions(parent, child.mixins[i], vm);
     }
   }
   var options = {};
   var key;
   for (key in parent) {
     mergeField(key);
   }
   for (key in child) {
     if (!hasOwn(parent, key)) {
       mergeField(key);
     }
   }
   function mergeField (key) {
     var strat = strats[key] || defaultStrat;
     options[key] = strat(parent[key], child[key], vm, key);
   }
   return options
 }
 
 /**
  * Resolve an asset.
  * This function is used because child instances need access
  * to assets defined in its ancestor chain.
  */
 function resolveAsset (
   options,
   type,
   id,
   warnMissing
 ) {
   /* istanbul ignore if */
   if (typeof id !== 'string') {
     return
   }
   var assets = options[type];
   // check local registration variations first
   if (hasOwn(assets, id)) { return assets[id] }
   var camelizedId = camelize(id);
   if (hasOwn(assets, camelizedId)) { return assets[camelizedId] }
   var PascalCaseId = capitalize(camelizedId);
   if (hasOwn(assets, PascalCaseId)) { return assets[PascalCaseId] }
   // fallback to prototype chain
   var res = assets[id] || assets[camelizedId] || assets[PascalCaseId];
   if ("development" !== 'production' && warnMissing && !res) {
     warn(
       'Failed to resolve ' + type.slice(0, -1) + ': ' + id,
       options
     );
   }
   return res
 }
 
 /*  */
 
 function validateProp (
   key,
   propOptions,
   propsData,
   vm
 ) {
   var prop = propOptions[key];
   var absent = !hasOwn(propsData, key);
   var value = propsData[key];
   // handle boolean props
   if (isType(Boolean, prop.type)) {
     if (absent && !hasOwn(prop, 'default')) {
       value = false;
     } else if (!isType(String, prop.type) && (value === '' || value === hyphenate(key))) {
       value = true;
     }
   }
   // check default value
   if (value === undefined) {
     value = getPropDefaultValue(vm, prop, key);
     // since the default value is a fresh copy,
     // make sure to observe it.
     var prevShouldConvert = observerState.shouldConvert;
     observerState.shouldConvert = true;
     observe(value);
     observerState.shouldConvert = prevShouldConvert;
   }
   {
     assertProp(prop, key, value, vm, absent);
   }
   return value
 }
 
 /**
  * Get the default value of a prop.
  */
 function getPropDefaultValue (vm, prop, key) {
   // no default, return undefined
   if (!hasOwn(prop, 'default')) {
     return undefined
   }
   var def = prop.default;
   // warn against non-factory defaults for Object & Array
   if ("development" !== 'production' && isObject(def)) {
     warn(
       'Invalid default value for prop "' + key + '": ' +
       'Props with type Object/Array must use a factory function ' +
       'to return the default value.',
       vm
     );
   }
   // the raw prop value was also undefined from previous render,
   // return previous default value to avoid unnecessary watcher trigger
   if (vm && vm.$options.propsData &&
     vm.$options.propsData[key] === undefined &&
     vm._props[key] !== undefined
   ) {
     return vm._props[key]
   }
   // call factory function for non-Function types
   // a value is Function if its prototype is function even across different execution context
   return typeof def === 'function' && getType(prop.type) !== 'Function'
     ? def.call(vm)
     : def
 }
 
 /**
  * Assert whether a prop is valid.
  */
 function assertProp (
   prop,
   name,
   value,
   vm,
   absent
 ) {
   if (prop.required && absent) {
     warn(
       'Missing required prop: "' + name + '"',
       vm
     );
     return
   }
   if (value == null && !prop.required) {
     return
   }
   var type = prop.type;
   var valid = !type || type === true;
   var expectedTypes = [];
   if (type) {
     if (!Array.isArray(type)) {
       type = [type];
     }
     for (var i = 0; i < type.length && !valid; i++) {
       var assertedType = assertType(value, type[i]);
       expectedTypes.push(assertedType.expectedType || '');
       valid = assertedType.valid;
     }
   }
   if (!valid) {
     warn(
       'Invalid prop: type check failed for prop "' + name + '".' +
       ' Expected ' + expectedTypes.map(capitalize).join(', ') +
       ', got ' + Object.prototype.toString.call(value).slice(8, -1) + '.',
       vm
     );
     return
   }
   var validator = prop.validator;
   if (validator) {
     if (!validator(value)) {
       warn(
         'Invalid prop: custom validator check failed for prop "' + name + '".',
         vm
       );
     }
   }
 }
 
 var simpleCheckRE = /^(String|Number|Boolean|Function|Symbol)$/;
 
 function assertType (value, type) {
   var valid;
   var expectedType = getType(type);
   if (simpleCheckRE.test(expectedType)) {
     valid = typeof value === expectedType.toLowerCase();
   } else if (expectedType === 'Object') {
     valid = isPlainObject(value);
   } else if (expectedType === 'Array') {
     valid = Array.isArray(value);
   } else {
     valid = value instanceof type;
   }
   return {
     valid: valid,
     expectedType: expectedType
   }
 }
 
 /**
  * Use function string name to check built-in types,
  * because a simple equality check will fail when running
  * across different vms / iframes.
  */
 function getType (fn) {
   var match = fn && fn.toString().match(/^\s*function (\w+)/);
   return match ? match[1] : ''
 }
 
 function isType (type, fn) {
   if (!Array.isArray(fn)) {
     return getType(fn) === getType(type)
   }
   for (var i = 0, len = fn.length; i < len; i++) {
     if (getType(fn[i]) === getType(type)) {
       return true
     }
   }
   /* istanbul ignore next */
   return false
 }
 
 /*  */
 
 var mark;
 var measure;
 
 {
   var perf = inBrowser && window.performance;
   /* istanbul ignore if */
   if (
     perf &&
     perf.mark &&
     perf.measure &&
     perf.clearMarks &&
     perf.clearMeasures
   ) {
     mark = function (tag) { return perf.mark(tag); };
     measure = function (name, startTag, endTag) {
       perf.measure(name, startTag, endTag);
       perf.clearMarks(startTag);
       perf.clearMarks(endTag);
       perf.clearMeasures(name);
     };
   }
 }
 
 /* not type checking this file because flow doesn't play well with Proxy */
 
 var initProxy;
 
 {
   var allowedGlobals = makeMap(
     'Infinity,undefined,NaN,isFinite,isNaN,' +
     'parseFloat,parseInt,decodeURI,decodeURIComponent,encodeURI,encodeURIComponent,' +
     'Math,Number,Date,Array,Object,Boolean,String,RegExp,Map,Set,JSON,Intl,' +
     'require' // for Webpack/Browserify
   );
 
   var warnNonPresent = function (target, key) {
     warn(
       "Property or method \"" + key + "\" is not defined on the instance but " +
       "referenced during render. Make sure to declare reactive data " +
       "properties in the data option.",
       target
     );
   };
 
   var hasProxy =
     typeof Proxy !== 'undefined' &&
     Proxy.toString().match(/native code/);
 
   if (hasProxy) {
     var isBuiltInModifier = makeMap('stop,prevent,self,ctrl,shift,alt,meta');
     config.keyCodes = new Proxy(config.keyCodes, {
       set: function set (target, key, value) {
         if (isBuiltInModifier(key)) {
           warn(("Avoid overwriting built-in modifier in config.keyCodes: ." + key));
           return false
         } else {
           target[key] = value;
           return true
         }
       }
     });
   }
 
   var hasHandler = {
     has: function has (target, key) {
       var has = key in target;
       var isAllowed = allowedGlobals(key) || key.charAt(0) === '_';
       if (!has && !isAllowed) {
         warnNonPresent(target, key);
       }
       return has || !isAllowed
     }
   };
 
   var getHandler = {
     get: function get (target, key) {
       if (typeof key === 'string' && !(key in target)) {
         warnNonPresent(target, key);
       }
       return target[key]
     }
   };
 
   initProxy = function initProxy (vm) {
     if (hasProxy) {
       // determine which proxy handler to use
       var options = vm.$options;
       var handlers = options.render && options.render._withStripped
         ? getHandler
         : hasHandler;
       vm._renderProxy = new Proxy(vm, handlers);
     } else {
       vm._renderProxy = vm;
     }
   };
 }
 
 /*  */
 
 var VNode = function VNode (
   tag,
   data,
   children,
   text,
   elm,
   context,
   componentOptions,
   asyncFactory
 ) {
   this.tag = tag;
   this.data = data;
   this.children = children;
   this.text = text;
   this.elm = elm;
   this.ns = undefined;
   this.context = context;
   this.functionalContext = undefined;
   this.key = data && data.key;
   this.componentOptions = componentOptions;
   this.componentInstance = undefined;
   this.parent = undefined;
   this.raw = false;
   this.isStatic = false;
   this.isRootInsert = true;
   this.isComment = false;
   this.isCloned = false;
   this.isOnce = false;
   this.asyncFactory = asyncFactory;
   this.asyncMeta = undefined;
   this.isAsyncPlaceholder = false;
 };
 
 var prototypeAccessors = { child: {} };
 
 // DEPRECATED: alias for componentInstance for backwards compat.
 /* istanbul ignore next */
 prototypeAccessors.child.get = function () {
   return this.componentInstance
 };
 
 Object.defineProperties( VNode.prototype, prototypeAccessors );
 
 var createEmptyVNode = function (text) {
   if ( text === void 0 ) text = '';
 
   var node = new VNode();
   node.text = text;
   node.isComment = true;
   return node
 };
 
 function createTextVNode (val) {
   return new VNode(undefined, undefined, undefined, String(val))
 }
 
 // optimized shallow clone
 // used for static nodes and slot nodes because they may be reused across
 // multiple renders, cloning them avoids errors when DOM manipulations rely
 // on their elm reference.
 function cloneVNode (vnode) {
   var cloned = new VNode(
     vnode.tag,
     vnode.data,
     vnode.children,
     vnode.text,
     vnode.elm,
     vnode.context,
     vnode.componentOptions,
     vnode.asyncFactory
   );
   cloned.ns = vnode.ns;
   cloned.isStatic = vnode.isStatic;
   cloned.key = vnode.key;
   cloned.isComment = vnode.isComment;
   cloned.isCloned = true;
   return cloned
 }
 
 function cloneVNodes (vnodes) {
   var len = vnodes.length;
   var res = new Array(len);
   for (var i = 0; i < len; i++) {
     res[i] = cloneVNode(vnodes[i]);
   }
   return res
 }
 
 /*  */
 
 var normalizeEvent = cached(function (name) {
   var passive = name.charAt(0) === '&';
   name = passive ? name.slice(1) : name;
   var once$$1 = name.charAt(0) === '~'; // Prefixed last, checked first
   name = once$$1 ? name.slice(1) : name;
   var capture = name.charAt(0) === '!';
   name = capture ? name.slice(1) : name;
   return {
     name: name,
     once: once$$1,
     capture: capture,
     passive: passive
   }
 });
 
 function createFnInvoker (fns) {
   function invoker () {
     var arguments$1 = arguments;
 
     var fns = invoker.fns;
     if (Array.isArray(fns)) {
       var cloned = fns.slice();
       for (var i = 0; i < cloned.length; i++) {
         cloned[i].apply(null, arguments$1);
       }
     } else {
       // return handler return value for single handlers
       return fns.apply(null, arguments)
     }
   }
   invoker.fns = fns;
   return invoker
 }
 
 function updateListeners (
   on,
   oldOn,
   add,
   remove$$1,
   vm
 ) {
   var name, cur, old, event;
   for (name in on) {
     cur = on[name];
     old = oldOn[name];
     event = normalizeEvent(name);
     if (isUndef(cur)) {
       "development" !== 'production' && warn(
         "Invalid handler for event \"" + (event.name) + "\": got " + String(cur),
         vm
       );
     } else if (isUndef(old)) {
       if (isUndef(cur.fns)) {
         cur = on[name] = createFnInvoker(cur);
       }
       add(event.name, cur, event.once, event.capture, event.passive);
     } else if (cur !== old) {
       old.fns = cur;
       on[name] = old;
     }
   }
   for (name in oldOn) {
     if (isUndef(on[name])) {
       event = normalizeEvent(name);
       remove$$1(event.name, oldOn[name], event.capture);
     }
   }
 }
 
 /*  */
 
 function mergeVNodeHook (def, hookKey, hook) {
   var invoker;
   var oldHook = def[hookKey];
 
   function wrappedHook () {
     hook.apply(this, arguments);
     // important: remove merged hook to ensure it's called only once
     // and prevent memory leak
     remove(invoker.fns, wrappedHook);
   }
 
   if (isUndef(oldHook)) {
     // no existing hook
     invoker = createFnInvoker([wrappedHook]);
   } else {
     /* istanbul ignore if */
     if (isDef(oldHook.fns) && isTrue(oldHook.merged)) {
       // already a merged invoker
       invoker = oldHook;
       invoker.fns.push(wrappedHook);
     } else {
       // existing plain hook
       invoker = createFnInvoker([oldHook, wrappedHook]);
     }
   }
 
   invoker.merged = true;
   def[hookKey] = invoker;
 }
 
 /*  */
 
 function extractPropsFromVNodeData (
   data,
   Ctor,
   tag
 ) {
   // we are only extracting raw values here.
   // validation and default values are handled in the child
   // component itself.
   var propOptions = Ctor.options.props;
   if (isUndef(propOptions)) {
     return
   }
   var res = {};
   var attrs = data.attrs;
   var props = data.props;
   if (isDef(attrs) || isDef(props)) {
     for (var key in propOptions) {
       var altKey = hyphenate(key);
       {
         var keyInLowerCase = key.toLowerCase();
         if (
           key !== keyInLowerCase &&
           attrs && hasOwn(attrs, keyInLowerCase)
         ) {
           tip(
             "Prop \"" + keyInLowerCase + "\" is passed to component " +
             (formatComponentName(tag || Ctor)) + ", but the declared prop name is" +
             " \"" + key + "\". " +
             "Note that HTML attributes are case-insensitive and camelCased " +
             "props need to use their kebab-case equivalents when using in-DOM " +
             "templates. You should probably use \"" + altKey + "\" instead of \"" + key + "\"."
           );
         }
       }
       checkProp(res, props, key, altKey, true) ||
       checkProp(res, attrs, key, altKey, false);
     }
   }
   return res
 }
 
 function checkProp (
   res,
   hash,
   key,
   altKey,
   preserve
 ) {
   if (isDef(hash)) {
     if (hasOwn(hash, key)) {
       res[key] = hash[key];
       if (!preserve) {
         delete hash[key];
       }
       return true
     } else if (hasOwn(hash, altKey)) {
       res[key] = hash[altKey];
       if (!preserve) {
         delete hash[altKey];
       }
       return true
     }
   }
   return false
 }
 
 /*  */
 
 // The template compiler attempts to minimize the need for normalization by
 // statically analyzing the template at compile time.
 //
 // For plain HTML markup, normalization can be completely skipped because the
 // generated render function is guaranteed to return Array<VNode>. There are
 // two cases where extra normalization is needed:
 
 // 1. When the children contains components - because a functional component
 // may return an Array instead of a single root. In this case, just a simple
 // normalization is needed - if any child is an Array, we flatten the whole
 // thing with Array.prototype.concat. It is guaranteed to be only 1-level deep
 // because functional components already normalize their own children.
 function simpleNormalizeChildren (children) {
   for (var i = 0; i < children.length; i++) {
     if (Array.isArray(children[i])) {
       return Array.prototype.concat.apply([], children)
     }
   }
   return children
 }
 
 // 2. When the children contains constructs that always generated nested Arrays,
 // e.g. <template>, <slot>, v-for, or when the children is provided by user
 // with hand-written render functions / JSX. In such cases a full normalization
 // is needed to cater to all possible types of children values.
 function normalizeChildren (children) {
   return isPrimitive(children)
     ? [createTextVNode(children)]
     : Array.isArray(children)
       ? normalizeArrayChildren(children)
       : undefined
 }
 
 function isTextNode (node) {
   return isDef(node) && isDef(node.text) && isFalse(node.isComment)
 }
 
 function normalizeArrayChildren (children, nestedIndex) {
   var res = [];
   var i, c, last;
   for (i = 0; i < children.length; i++) {
     c = children[i];
     if (isUndef(c) || typeof c === 'boolean') { continue }
     last = res[res.length - 1];
     //  nested
     if (Array.isArray(c)) {
       res.push.apply(res, normalizeArrayChildren(c, ((nestedIndex || '') + "_" + i)));
     } else if (isPrimitive(c)) {
       if (isTextNode(last)) {
         // merge adjacent text nodes
         // this is necessary for SSR hydration because text nodes are
         // essentially merged when rendered to HTML strings
         (last).text += String(c);
       } else if (c !== '') {
         // convert primitive to vnode
         res.push(createTextVNode(c));
       }
     } else {
       if (isTextNode(c) && isTextNode(last)) {
         // merge adjacent text nodes
         res[res.length - 1] = createTextVNode(last.text + c.text);
       } else {
         // default key for nested array children (likely generated by v-for)
         if (isTrue(children._isVList) &&
           isDef(c.tag) &&
           isUndef(c.key) &&
           isDef(nestedIndex)) {
           c.key = "__vlist" + nestedIndex + "_" + i + "__";
         }
         res.push(c);
       }
     }
   }
   return res
 }
 
 /*  */
 
 function ensureCtor (comp, base) {
   if (comp.__esModule && comp.default) {
     comp = comp.default;
   }
   return isObject(comp)
     ? base.extend(comp)
     : comp
 }
 
 function createAsyncPlaceholder (
   factory,
   data,
   context,
   children,
   tag
 ) {
   var node = createEmptyVNode();
   node.asyncFactory = factory;
   node.asyncMeta = { data: data, context: context, children: children, tag: tag };
   return node
 }
 
 function resolveAsyncComponent (
   factory,
   baseCtor,
   context
 ) {
   if (isTrue(factory.error) && isDef(factory.errorComp)) {
     return factory.errorComp
   }
 
   if (isDef(factory.resolved)) {
     return factory.resolved
   }
 
   if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
     return factory.loadingComp
   }
 
   if (isDef(factory.contexts)) {
     // already pending
     factory.contexts.push(context);
   } else {
     var contexts = factory.contexts = [context];
     var sync = true;
 
     var forceRender = function () {
       for (var i = 0, l = contexts.length; i < l; i++) {
         contexts[i].$forceUpdate();
       }
     };
 
     var resolve = once(function (res) {
       // cache resolved
       factory.resolved = ensureCtor(res, baseCtor);
       // invoke callbacks only if this is not a synchronous resolve
       // (async resolves are shimmed as synchronous during SSR)
       if (!sync) {
         forceRender();
       }
     });
 
     var reject = once(function (reason) {
       "development" !== 'production' && warn(
         "Failed to resolve async component: " + (String(factory)) +
         (reason ? ("\nReason: " + reason) : '')
       );
       if (isDef(factory.errorComp)) {
         factory.error = true;
         forceRender();
       }
     });
 
     var res = factory(resolve, reject);
 
     if (isObject(res)) {
       if (typeof res.then === 'function') {
         // () => Promise
         if (isUndef(factory.resolved)) {
           res.then(resolve, reject);
         }
       } else if (isDef(res.component) && typeof res.component.then === 'function') {
         res.component.then(resolve, reject);
 
         if (isDef(res.error)) {
           factory.errorComp = ensureCtor(res.error, baseCtor);
         }
 
         if (isDef(res.loading)) {
           factory.loadingComp = ensureCtor(res.loading, baseCtor);
           if (res.delay === 0) {
             factory.loading = true;
           } else {
             setTimeout(function () {
               if (isUndef(factory.resolved) && isUndef(factory.error)) {
                 factory.loading = true;
                 forceRender();
               }
             }, res.delay || 200);
           }
         }
 
         if (isDef(res.timeout)) {
           setTimeout(function () {
             if (isUndef(factory.resolved)) {
               reject(
                 "timeout (" + (res.timeout) + "ms)"
               );
             }
           }, res.timeout);
         }
       }
     }
 
     sync = false;
     // return in case resolved synchronously
     return factory.loading
       ? factory.loadingComp
       : factory.resolved
   }
 }
 
 /*  */
 
 function getFirstComponentChild (children) {
   if (Array.isArray(children)) {
     for (var i = 0; i < children.length; i++) {
       var c = children[i];
       if (isDef(c) && isDef(c.componentOptions)) {
         return c
       }
     }
   }
 }
 
 /*  */
 
 /*  */
 
 function initEvents (vm) {
   vm._events = Object.create(null);
   vm._hasHookEvent = false;
   // init parent attached events
   var listeners = vm.$options._parentListeners;
   if (listeners) {
     updateComponentListeners(vm, listeners);
   }
 }
 
 var target;
 
 function add (event, fn, once$$1) {
   if (once$$1) {
     target.$once(event, fn);
   } else {
     target.$on(event, fn);
   }
 }
 
 function remove$1 (event, fn) {
   target.$off(event, fn);
 }
 
 function updateComponentListeners (
   vm,
   listeners,
   oldListeners
 ) {
   target = vm;
   updateListeners(listeners, oldListeners || {}, add, remove$1, vm);
 }
 
 function eventsMixin (Vue) {
   var hookRE = /^hook:/;
   Vue.prototype.$on = function (event, fn) {
     var this$1 = this;
 
     var vm = this;
     if (Array.isArray(event)) {
       for (var i = 0, l = event.length; i < l; i++) {
         this$1.$on(event[i], fn);
       }
     } else {
       (vm._events[event] || (vm._events[event] = [])).push(fn);
       // optimize hook:event cost by using a boolean flag marked at registration
       // instead of a hash lookup
       if (hookRE.test(event)) {
         vm._hasHookEvent = true;
       }
     }
     return vm
   };
 
   Vue.prototype.$once = function (event, fn) {
     var vm = this;
     function on () {
       vm.$off(event, on);
       fn.apply(vm, arguments);
     }
     on.fn = fn;
     vm.$on(event, on);
     return vm
   };
 
   Vue.prototype.$off = function (event, fn) {
     var this$1 = this;
 
     var vm = this;
     // all
     if (!arguments.length) {
       vm._events = Object.create(null);
       return vm
     }
     // array of events
     if (Array.isArray(event)) {
       for (var i$1 = 0, l = event.length; i$1 < l; i$1++) {
         this$1.$off(event[i$1], fn);
       }
       return vm
     }
     // specific event
     var cbs = vm._events[event];
     if (!cbs) {
       return vm
     }
     if (arguments.length === 1) {
       vm._events[event] = null;
       return vm
     }
     // specific handler
     var cb;
     var i = cbs.length;
     while (i--) {
       cb = cbs[i];
       if (cb === fn || cb.fn === fn) {
         cbs.splice(i, 1);
         break
       }
     }
     return vm
   };
 
   Vue.prototype.$emit = function (event) {
     var vm = this;
     {
       var lowerCaseEvent = event.toLowerCase();
       if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
         tip(
           "Event \"" + lowerCaseEvent + "\" is emitted in component " +
           (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
           "Note that HTML attributes are case-insensitive and you cannot use " +
           "v-on to listen to camelCase events when using in-DOM templates. " +
           "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
         );
       }
     }
     var cbs = vm._events[event];
     if (cbs) {
       cbs = cbs.length > 1 ? toArray(cbs) : cbs;
       var args = toArray(arguments, 1);
       for (var i = 0, l = cbs.length; i < l; i++) {
         try {
           cbs[i].apply(vm, args);
         } catch (e) {
           handleError(e, vm, ("event handler for \"" + event + "\""));
         }
       }
     }
     return vm
   };
 }
 
 /*  */
 
 /**
  * Runtime helper for resolving raw children VNodes into a slot object.
  */
 function resolveSlots (
   children,
   context
 ) {
   var slots = {};
   if (!children) {
     return slots
   }
   var defaultSlot = [];
   for (var i = 0, l = children.length; i < l; i++) {
     var child = children[i];
     // named slots should only be respected if the vnode was rendered in the
     // same context.
     if ((child.context === context || child.functionalContext === context) &&
       child.data && child.data.slot != null
     ) {
       var name = child.data.slot;
       var slot = (slots[name] || (slots[name] = []));
       if (child.tag === 'template') {
         slot.push.apply(slot, child.children);
       } else {
         slot.push(child);
       }
     } else {
       defaultSlot.push(child);
     }
   }
   // ignore whitespace
   if (!defaultSlot.every(isWhitespace)) {
     slots.default = defaultSlot;
   }
   return slots
 }
 
 function isWhitespace (node) {
   return node.isComment || node.text === ' '
 }
 
 function resolveScopedSlots (
   fns, // see flow/vnode
   res
 ) {
   res = res || {};
   for (var i = 0; i < fns.length; i++) {
     if (Array.isArray(fns[i])) {
       resolveScopedSlots(fns[i], res);
     } else {
       res[fns[i].key] = fns[i].fn;
     }
   }
   return res
 }
 
 /*  */
 
 var activeInstance = null;
 var isUpdatingChildComponent = false;
 
 function initLifecycle (vm) {
   var options = vm.$options;
 
   // locate first non-abstract parent
   var parent = options.parent;
   if (parent && !options.abstract) {
     while (parent.$options.abstract && parent.$parent) {
       parent = parent.$parent;
     }
     parent.$children.push(vm);
   }
 
   vm.$parent = parent;
   vm.$root = parent ? parent.$root : vm;
 
   vm.$children = [];
   vm.$refs = {};
 
   vm._watcher = null;
   vm._inactive = null;
   vm._directInactive = false;
   vm._isMounted = false;
   vm._isDestroyed = false;
   vm._isBeingDestroyed = false;
 }
 
 function lifecycleMixin (Vue) {
   Vue.prototype._update = function (vnode, hydrating) {
     var vm = this;
     if (vm._isMounted) {
       callHook(vm, 'beforeUpdate');
     }
     var prevEl = vm.$el;
     var prevVnode = vm._vnode;
     var prevActiveInstance = activeInstance;
     activeInstance = vm;
     vm._vnode = vnode;
     // Vue.prototype.__patch__ is injected in entry points
     // based on the rendering backend used.
     if (!prevVnode) {
       // initial render
       vm.$el = vm.__patch__(
         vm.$el, vnode, hydrating, false /* removeOnly */,
         vm.$options._parentElm,
         vm.$options._refElm
       );
       // no need for the ref nodes after initial patch
       // this prevents keeping a detached DOM tree in memory (#5851)
       vm.$options._parentElm = vm.$options._refElm = null;
     } else {
       // updates
       vm.$el = vm.__patch__(prevVnode, vnode);
     }
     activeInstance = prevActiveInstance;
     // update __vue__ reference
     if (prevEl) {
       prevEl.__vue__ = null;
     }
     if (vm.$el) {
       vm.$el.__vue__ = vm;
     }
     // if parent is an HOC, update its $el as well
     if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
       vm.$parent.$el = vm.$el;
     }
     // updated hook is called by the scheduler to ensure that children are
     // updated in a parent's updated hook.
   };
 
   Vue.prototype.$forceUpdate = function () {
     var vm = this;
     if (vm._watcher) {
       vm._watcher.update();
     }
   };
 
   Vue.prototype.$destroy = function () {
     var vm = this;
     if (vm._isBeingDestroyed) {
       return
     }
     callHook(vm, 'beforeDestroy');
     vm._isBeingDestroyed = true;
     // remove self from parent
     var parent = vm.$parent;
     if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
       remove(parent.$children, vm);
     }
     // teardown watchers
     if (vm._watcher) {
       vm._watcher.teardown();
     }
     var i = vm._watchers.length;
     while (i--) {
       vm._watchers[i].teardown();
     }
     // remove reference from data ob
     // frozen object may not have observer.
     if (vm._data.__ob__) {
       vm._data.__ob__.vmCount--;
     }
     // call the last hook...
     vm._isDestroyed = true;
     // invoke destroy hooks on current rendered tree
     vm.__patch__(vm._vnode, null);
     // fire destroyed hook
     callHook(vm, 'destroyed');
     // turn off all instance listeners.
     vm.$off();
     // remove __vue__ reference
     if (vm.$el) {
       vm.$el.__vue__ = null;
     }
   };
 }
 
 function mountComponent (
   vm,
   el,
   hydrating
 ) {
   vm.$el = el;
   if (!vm.$options.render) {
     vm.$options.render = createEmptyVNode;
     {
       /* istanbul ignore if */
       if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
         vm.$options.el || el) {
         warn(
           'You are using the runtime-only build of Vue where the template ' +
           'compiler is not available. Either pre-compile the templates into ' +
           'render functions, or use the compiler-included build.',
           vm
         );
       } else {
         warn(
           'Failed to mount component: template or render function not defined.',
           vm
         );
       }
     }
   }
   callHook(vm, 'beforeMount');
 
   var updateComponent;
   /* istanbul ignore if */
   if ("development" !== 'production' && config.performance && mark) {
     updateComponent = function () {
       var name = vm._name;
       var id = vm._uid;
       var startTag = "vue-perf-start:" + id;
       var endTag = "vue-perf-end:" + id;
 
       mark(startTag);
       var vnode = vm._render();
       mark(endTag);
       measure((name + " render"), startTag, endTag);
 
       mark(startTag);
       vm._update(vnode, hydrating);
       mark(endTag);
       measure((name + " patch"), startTag, endTag);
     };
   } else {
     updateComponent = function () {
       vm._update(vm._render(), hydrating);
     };
   }
 
   vm._watcher = new Watcher(vm, updateComponent, noop);
   hydrating = false;
 
   // manually mounted instance, call mounted on self
   // mounted is called for render-created child components in its inserted hook
   if (vm.$vnode == null) {
     vm._isMounted = true;
     callHook(vm, 'mounted');
   }
   return vm
 }
 
 function updateChildComponent (
   vm,
   propsData,
   listeners,
   parentVnode,
   renderChildren
 ) {
   {
     isUpdatingChildComponent = true;
   }
 
   // determine whether component has slot children
   // we need to do this before overwriting $options._renderChildren
   var hasChildren = !!(
     renderChildren ||               // has new static slots
     vm.$options._renderChildren ||  // has old static slots
     parentVnode.data.scopedSlots || // has new scoped slots
     vm.$scopedSlots !== emptyObject // has old scoped slots
   );
 
   vm.$options._parentVnode = parentVnode;
   vm.$vnode = parentVnode; // update vm's placeholder node without re-render
 
   if (vm._vnode) { // update child tree's parent
     vm._vnode.parent = parentVnode;
   }
   vm.$options._renderChildren = renderChildren;
 
   // update $attrs and $listensers hash
   // these are also reactive so they may trigger child update if the child
   // used them during render
   vm.$attrs = parentVnode.data && parentVnode.data.attrs;
   vm.$listeners = listeners;
 
   // update props
   if (propsData && vm.$options.props) {
     observerState.shouldConvert = false;
     var props = vm._props;
     var propKeys = vm.$options._propKeys || [];
     for (var i = 0; i < propKeys.length; i++) {
       var key = propKeys[i];
       props[key] = validateProp(key, vm.$options.props, propsData, vm);
     }
     observerState.shouldConvert = true;
     // keep a copy of raw propsData
     vm.$options.propsData = propsData;
   }
 
   // update listeners
   if (listeners) {
     var oldListeners = vm.$options._parentListeners;
     vm.$options._parentListeners = listeners;
     updateComponentListeners(vm, listeners, oldListeners);
   }
   // resolve slots + force update if has children
   if (hasChildren) {
     vm.$slots = resolveSlots(renderChildren, parentVnode.context);
     vm.$forceUpdate();
   }
 
   {
     isUpdatingChildComponent = false;
   }
 }
 
 function isInInactiveTree (vm) {
   while (vm && (vm = vm.$parent)) {
     if (vm._inactive) { return true }
   }
   return false
 }
 
 function activateChildComponent (vm, direct) {
   if (direct) {
     vm._directInactive = false;
     if (isInInactiveTree(vm)) {
       return
     }
   } else if (vm._directInactive) {
     return
   }
   if (vm._inactive || vm._inactive === null) {
     vm._inactive = false;
     for (var i = 0; i < vm.$children.length; i++) {
       activateChildComponent(vm.$children[i]);
     }
     callHook(vm, 'activated');
   }
 }
 
 function deactivateChildComponent (vm, direct) {
   if (direct) {
     vm._directInactive = true;
     if (isInInactiveTree(vm)) {
       return
     }
   }
   if (!vm._inactive) {
     vm._inactive = true;
     for (var i = 0; i < vm.$children.length; i++) {
       deactivateChildComponent(vm.$children[i]);
     }
     callHook(vm, 'deactivated');
   }
 }
 
 function callHook (vm, hook) {
   var handlers = vm.$options[hook];
   if (handlers) {
     for (var i = 0, j = handlers.length; i < j; i++) {
       try {
         handlers[i].call(vm);
       } catch (e) {
         handleError(e, vm, (hook + " hook"));
       }
     }
   }
   if (vm._hasHookEvent) {
     vm.$emit('hook:' + hook);
   }
 }
 
 /*  */
 
 
 var MAX_UPDATE_COUNT = 100;
 
 var queue = [];
 var activatedChildren = [];
 var has = {};
 var circular = {};
 var waiting = false;
 var flushing = false;
 var index = 0;
 
 /**
  * Reset the scheduler's state.
  */
 function resetSchedulerState () {
   index = queue.length = activatedChildren.length = 0;
   has = {};
   {
     circular = {};
   }
   waiting = flushing = false;
 }
 
 /**
  * Flush both queues and run the watchers.
  */
 function flushSchedulerQueue () {
   flushing = true;
   var watcher, id;
 
   // Sort queue before flush.
   // This ensures that:
   // 1. Components are updated from parent to child. (because parent is always
   //    created before the child)
   // 2. A component's user watchers are run before its render watcher (because
   //    user watchers are created before the render watcher)
   // 3. If a component is destroyed during a parent component's watcher run,
   //    its watchers can be skipped.
   queue.sort(function (a, b) { return a.id - b.id; });
 
   // do not cache length because more watchers might be pushed
   // as we run existing watchers
   for (index = 0; index < queue.length; index++) {
     watcher = queue[index];
     id = watcher.id;
     has[id] = null;
     watcher.run();
     // in dev build, check and stop circular updates.
     if ("development" !== 'production' && has[id] != null) {
       circular[id] = (circular[id] || 0) + 1;
       if (circular[id] > MAX_UPDATE_COUNT) {
         warn(
           'You may have an infinite update loop ' + (
             watcher.user
               ? ("in watcher with expression \"" + (watcher.expression) + "\"")
               : "in a component render function."
           ),
           watcher.vm
         );
         break
       }
     }
   }
 
   // keep copies of post queues before resetting state
   var activatedQueue = activatedChildren.slice();
   var updatedQueue = queue.slice();
 
   resetSchedulerState();
 
   // call component updated and activated hooks
   callActivatedHooks(activatedQueue);
   callUpdatedHooks(updatedQueue);
 
   // devtool hook
   /* istanbul ignore if */
   if (devtools && config.devtools) {
     devtools.emit('flush');
   }
 }
 
 function callUpdatedHooks (queue) {
   var i = queue.length;
   while (i--) {
     var watcher = queue[i];
     var vm = watcher.vm;
     if (vm._watcher === watcher && vm._isMounted) {
       callHook(vm, 'updated');
     }
   }
 }
 
 /**
  * Queue a kept-alive component that was activated during patch.
  * The queue will be processed after the entire tree has been patched.
  */
 function queueActivatedComponent (vm) {
   // setting _inactive to false here so that a render function can
   // rely on checking whether it's in an inactive tree (e.g. router-view)
   vm._inactive = false;
   activatedChildren.push(vm);
 }
 
 function callActivatedHooks (queue) {
   for (var i = 0; i < queue.length; i++) {
     queue[i]._inactive = true;
     activateChildComponent(queue[i], true /* true */);
   }
 }
 
 /**
  * Push a watcher into the watcher queue.
  * Jobs with duplicate IDs will be skipped unless it's
  * pushed when the queue is being flushed.
  */
 function queueWatcher (watcher) {
   var id = watcher.id;
   if (has[id] == null) {
     has[id] = true;
     if (!flushing) {
       queue.push(watcher);
     } else {
       // if already flushing, splice the watcher based on its id
       // if already past its id, it will be run next immediately.
       var i = queue.length - 1;
       while (i > index && queue[i].id > watcher.id) {
         i--;
       }
       queue.splice(i + 1, 0, watcher);
     }
     // queue the flush
     if (!waiting) {
       waiting = true;
       nextTick(flushSchedulerQueue);
     }
   }
 }
 
 /*  */
 
 var uid$2 = 0;
 
 /**
  * A watcher parses an expression, collects dependencies,
  * and fires callback when the expression value changes.
  * This is used for both the $watch() api and directives.
  */
 var Watcher = function Watcher (
   vm,
   expOrFn,
   cb,
   options
 ) {
   this.vm = vm;
   vm._watchers.push(this);
   // options
   if (options) {
     this.deep = !!options.deep;
     this.user = !!options.user;
     this.lazy = !!options.lazy;
     this.sync = !!options.sync;
   } else {
     this.deep = this.user = this.lazy = this.sync = false;
   }
   this.cb = cb;
   this.id = ++uid$2; // uid for batching
   this.active = true;
   this.dirty = this.lazy; // for lazy watchers
   this.deps = [];
   this.newDeps = [];
   this.depIds = new _Set();
   this.newDepIds = new _Set();
   this.expression = expOrFn.toString();
   // parse expression for getter
   if (typeof expOrFn === 'function') {
     this.getter = expOrFn;
   } else {
     this.getter = parsePath(expOrFn);
     if (!this.getter) {
       this.getter = function () {};
       "development" !== 'production' && warn(
         "Failed watching path: \"" + expOrFn + "\" " +
         'Watcher only accepts simple dot-delimited paths. ' +
         'For full control, use a function instead.',
         vm
       );
     }
   }
   this.value = this.lazy
     ? undefined
     : this.get();
 };
 
 /**
  * Evaluate the getter, and re-collect dependencies.
  */
 Watcher.prototype.get = function get () {
   pushTarget(this);
   var value;
   var vm = this.vm;
   try {
     value = this.getter.call(vm, vm);
   } catch (e) {
     if (this.user) {
       handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
     } else {
       throw e
     }
   } finally {
     // "touch" every property so they are all tracked as
     // dependencies for deep watching
     if (this.deep) {
       traverse(value);
     }
     popTarget();
     this.cleanupDeps();
   }
   return value
 };
 
 /**
  * Add a dependency to this directive.
  */
 Watcher.prototype.addDep = function addDep (dep) {
   var id = dep.id;
   if (!this.newDepIds.has(id)) {
     this.newDepIds.add(id);
     this.newDeps.push(dep);
     if (!this.depIds.has(id)) {
       dep.addSub(this);
     }
   }
 };
 
 /**
  * Clean up for dependency collection.
  */
 Watcher.prototype.cleanupDeps = function cleanupDeps () {
     var this$1 = this;
 
   var i = this.deps.length;
   while (i--) {
     var dep = this$1.deps[i];
     if (!this$1.newDepIds.has(dep.id)) {
       dep.removeSub(this$1);
     }
   }
   var tmp = this.depIds;
   this.depIds = this.newDepIds;
   this.newDepIds = tmp;
   this.newDepIds.clear();
   tmp = this.deps;
   this.deps = this.newDeps;
   this.newDeps = tmp;
   this.newDeps.length = 0;
 };
 
 /**
  * Subscriber interface.
  * Will be called when a dependency changes.
  */
 Watcher.prototype.update = function update () {
   /* istanbul ignore else */
   if (this.lazy) {
     this.dirty = true;
   } else if (this.sync) {
     this.run();
   } else {
     queueWatcher(this);
   }
 };
 
 /**
  * Scheduler job interface.
  * Will be called by the scheduler.
  */
 Watcher.prototype.run = function run () {
   if (this.active) {
     var value = this.get();
     if (
       value !== this.value ||
       // Deep watchers and watchers on Object/Arrays should fire even
       // when the value is the same, because the value may
       // have mutated.
       isObject(value) ||
       this.deep
     ) {
       // set new value
       var oldValue = this.value;
       this.value = value;
       if (this.user) {
         try {
           this.cb.call(this.vm, value, oldValue);
         } catch (e) {
           handleError(e, this.vm, ("callback for watcher \"" + (this.expression) + "\""));
         }
       } else {
         this.cb.call(this.vm, value, oldValue);
       }
     }
   }
 };
 
 /**
  * Evaluate the value of the watcher.
  * This only gets called for lazy watchers.
  */
 Watcher.prototype.evaluate = function evaluate () {
   this.value = this.get();
   this.dirty = false;
 };
 
 /**
  * Depend on all deps collected by this watcher.
  */
 Watcher.prototype.depend = function depend () {
     var this$1 = this;
 
   var i = this.deps.length;
   while (i--) {
     this$1.deps[i].depend();
   }
 };
 
 /**
  * Remove self from all dependencies' subscriber list.
  */
 Watcher.prototype.teardown = function teardown () {
     var this$1 = this;
 
   if (this.active) {
     // remove self from vm's watcher list
     // this is a somewhat expensive operation so we skip it
     // if the vm is being destroyed.
     if (!this.vm._isBeingDestroyed) {
       remove(this.vm._watchers, this);
     }
     var i = this.deps.length;
     while (i--) {
       this$1.deps[i].removeSub(this$1);
     }
     this.active = false;
   }
 };
 
 /**
  * Recursively traverse an object to evoke all converted
  * getters, so that every nested property inside the object
  * is collected as a "deep" dependency.
  */
 var seenObjects = new _Set();
 function traverse (val) {
   seenObjects.clear();
   _traverse(val, seenObjects);
 }
 
 function _traverse (val, seen) {
   var i, keys;
   var isA = Array.isArray(val);
   if ((!isA && !isObject(val)) || !Object.isExtensible(val)) {
     return
   }
   if (val.__ob__) {
     var depId = val.__ob__.dep.id;
     if (seen.has(depId)) {
       return
     }
     seen.add(depId);
   }
   if (isA) {
     i = val.length;
     while (i--) { _traverse(val[i], seen); }
   } else {
     keys = Object.keys(val);
     i = keys.length;
     while (i--) { _traverse(val[keys[i]], seen); }
   }
 }
 
 /*  */
 
 var sharedPropertyDefinition = {
   enumerable: true,
   configurable: true,
   get: noop,
   set: noop
 };
 
 function proxy (target, sourceKey, key) {
   sharedPropertyDefinition.get = function proxyGetter () {
     return this[sourceKey][key]
   };
   sharedPropertyDefinition.set = function proxySetter (val) {
     this[sourceKey][key] = val;
   };
   Object.defineProperty(target, key, sharedPropertyDefinition);
 }
 
 function initState (vm) {
   vm._watchers = [];
   var opts = vm.$options;
   if (opts.props) { initProps(vm, opts.props); }
   if (opts.methods) { initMethods(vm, opts.methods); }
   if (opts.data) {
     initData(vm);
   } else {
     observe(vm._data = {}, true /* asRootData */);
   }
   if (opts.computed) { initComputed(vm, opts.computed); }
   if (opts.watch && opts.watch !== nativeWatch) {
     initWatch(vm, opts.watch);
   }
 }
 
 function checkOptionType (vm, name) {
   var option = vm.$options[name];
   if (!isPlainObject(option)) {
     warn(
       ("component option \"" + name + "\" should be an object."),
       vm
     );
   }
 }
 
 function initProps (vm, propsOptions) {
   var propsData = vm.$options.propsData || {};
   var props = vm._props = {};
   // cache prop keys so that future props updates can iterate using Array
   // instead of dynamic object key enumeration.
   var keys = vm.$options._propKeys = [];
   var isRoot = !vm.$parent;
   // root instance props should be converted
   observerState.shouldConvert = isRoot;
   var loop = function ( key ) {
     keys.push(key);
     var value = validateProp(key, propsOptions, propsData, vm);
     /* istanbul ignore else */
     {
       if (isReservedAttribute(key) || config.isReservedAttr(key)) {
         warn(
           ("\"" + key + "\" is a reserved attribute and cannot be used as component prop."),
           vm
         );
       }
       defineReactive$$1(props, key, value, function () {
         if (vm.$parent && !isUpdatingChildComponent) {
           warn(
             "Avoid mutating a prop directly since the value will be " +
             "overwritten whenever the parent component re-renders. " +
             "Instead, use a data or computed property based on the prop's " +
             "value. Prop being mutated: \"" + key + "\"",
             vm
           );
         }
       });
     }
     // static props are already proxied on the component's prototype
     // during Vue.extend(). We only need to proxy props defined at
     // instantiation here.
     if (!(key in vm)) {
       proxy(vm, "_props", key);
     }
   };
 
   for (var key in propsOptions) loop( key );
   observerState.shouldConvert = true;
 }
 
 function initData (vm) {
   var data = vm.$options.data;
   data = vm._data = typeof data === 'function'
     ? getData(data, vm)
     : data || {};
   if (!isPlainObject(data)) {
     data = {};
     "development" !== 'production' && warn(
       'data functions should return an object:\n' +
       'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
       vm
     );
   }
   // proxy data on instance
   var keys = Object.keys(data);
   var props = vm.$options.props;
   var methods = vm.$options.methods;
   var i = keys.length;
   while (i--) {
     var key = keys[i];
     {
       if (methods && hasOwn(methods, key)) {
         warn(
           ("method \"" + key + "\" has already been defined as a data property."),
           vm
         );
       }
     }
     if (props && hasOwn(props, key)) {
       "development" !== 'production' && warn(
         "The data property \"" + key + "\" is already declared as a prop. " +
         "Use prop default value instead.",
         vm
       );
     } else if (!isReserved(key)) {
       proxy(vm, "_data", key);
     }
   }
   // observe data
   observe(data, true /* asRootData */);
 }
 
 function getData (data, vm) {
   try {
     return data.call(vm)
   } catch (e) {
     handleError(e, vm, "data()");
     return {}
   }
 }
 
 var computedWatcherOptions = { lazy: true };
 
 function initComputed (vm, computed) {
   "development" !== 'production' && checkOptionType(vm, 'computed');
   var watchers = vm._computedWatchers = Object.create(null);
 
   for (var key in computed) {
     var userDef = computed[key];
     var getter = typeof userDef === 'function' ? userDef : userDef.get;
     {
       if (getter === undefined) {
         warn(
           ("No getter function has been defined for computed property \"" + key + "\"."),
           vm
         );
         getter = noop;
       }
     }
     // create internal watcher for the computed property.
     watchers[key] = new Watcher(vm, getter, noop, computedWatcherOptions);
 
     // component-defined computed properties are already defined on the
     // component prototype. We only need to define computed properties defined
     // at instantiation here.
     if (!(key in vm)) {
       defineComputed(vm, key, userDef);
     } else {
       if (key in vm.$data) {
         warn(("The computed property \"" + key + "\" is already defined in data."), vm);
       } else if (vm.$options.props && key in vm.$options.props) {
         warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
       }
     }
   }
 }
 
 function defineComputed (target, key, userDef) {
   if (typeof userDef === 'function') {
     sharedPropertyDefinition.get = createComputedGetter(key);
     sharedPropertyDefinition.set = noop;
   } else {
     sharedPropertyDefinition.get = userDef.get
       ? userDef.cache !== false
         ? createComputedGetter(key)
         : userDef.get
       : noop;
     sharedPropertyDefinition.set = userDef.set
       ? userDef.set
       : noop;
   }
   Object.defineProperty(target, key, sharedPropertyDefinition);
 }
 
 function createComputedGetter (key) {
   return function computedGetter () {
     var watcher = this._computedWatchers && this._computedWatchers[key];
     if (watcher) {
       if (watcher.dirty) {
         watcher.evaluate();
       }
       if (Dep.target) {
         watcher.depend();
       }
       return watcher.value
     }
   }
 }
 
 function initMethods (vm, methods) {
   "development" !== 'production' && checkOptionType(vm, 'methods');
   var props = vm.$options.props;
   for (var key in methods) {
     vm[key] = methods[key] == null ? noop : bind(methods[key], vm);
     {
       if (methods[key] == null) {
         warn(
           "method \"" + key + "\" has an undefined value in the component definition. " +
           "Did you reference the function correctly?",
           vm
         );
       }
       if (props && hasOwn(props, key)) {
         warn(
           ("method \"" + key + "\" has already been defined as a prop."),
           vm
         );
       }
     }
   }
 }
 
 function initWatch (vm, watch) {
   "development" !== 'production' && checkOptionType(vm, 'watch');
   for (var key in watch) {
     var handler = watch[key];
     if (Array.isArray(handler)) {
       for (var i = 0; i < handler.length; i++) {
         createWatcher(vm, key, handler[i]);
       }
     } else {
       createWatcher(vm, key, handler);
     }
   }
 }
 
 function createWatcher (
   vm,
   keyOrFn,
   handler,
   options
 ) {
   if (isPlainObject(handler)) {
     options = handler;
     handler = handler.handler;
   }
   if (typeof handler === 'string') {
     handler = vm[handler];
   }
   return vm.$watch(keyOrFn, handler, options)
 }
 
 function stateMixin (Vue) {
   // flow somehow has problems with directly declared definition object
   // when using Object.defineProperty, so we have to procedurally build up
   // the object here.
   var dataDef = {};
   dataDef.get = function () { return this._data };
   var propsDef = {};
   propsDef.get = function () { return this._props };
   {
     dataDef.set = function (newData) {
       warn(
         'Avoid replacing instance root $data. ' +
         'Use nested data properties instead.',
         this
       );
     };
     propsDef.set = function () {
       warn("$props is readonly.", this);
     };
   }
   Object.defineProperty(Vue.prototype, '$data', dataDef);
   Object.defineProperty(Vue.prototype, '$props', propsDef);
 
   Vue.prototype.$set = set;
   Vue.prototype.$delete = del;
 
   Vue.prototype.$watch = function (
     expOrFn,
     cb,
     options
   ) {
     var vm = this;
     if (isPlainObject(cb)) {
       return createWatcher(vm, expOrFn, cb, options)
     }
     options = options || {};
     options.user = true;
     var watcher = new Watcher(vm, expOrFn, cb, options);
     if (options.immediate) {
       cb.call(vm, watcher.value);
     }
     return function unwatchFn () {
       watcher.teardown();
     }
   };
 }
 
 /*  */
 
 function initProvide (vm) {
   var provide = vm.$options.provide;
   if (provide) {
     vm._provided = typeof provide === 'function'
       ? provide.call(vm)
       : provide;
   }
 }
 
 function initInjections (vm) {
   var result = resolveInject(vm.$options.inject, vm);
   if (result) {
     observerState.shouldConvert = false;
     Object.keys(result).forEach(function (key) {
       /* istanbul ignore else */
       {
         defineReactive$$1(vm, key, result[key], function () {
           warn(
             "Avoid mutating an injected value directly since the changes will be " +
             "overwritten whenever the provided component re-renders. " +
             "injection being mutated: \"" + key + "\"",
             vm
           );
         });
       }
     });
     observerState.shouldConvert = true;
   }
 }
 
 function resolveInject (inject, vm) {
   if (inject) {
     // inject is :any because flow is not smart enough to figure out cached
     var result = Object.create(null);
     var keys = hasSymbol
         ? Reflect.ownKeys(inject)
         : Object.keys(inject);
 
     for (var i = 0; i < keys.length; i++) {
       var key = keys[i];
       var provideKey = inject[key];
       var source = vm;
       while (source) {
         if (source._provided && provideKey in source._provided) {
           result[key] = source._provided[provideKey];
           break
         }
         source = source.$parent;
       }
       if ("development" !== 'production' && !hasOwn(result, key)) {
         warn(("Injection \"" + key + "\" not found"), vm);
       }
     }
     return result
   }
 }
 
 /*  */
 
 function createFunctionalComponent (
   Ctor,
   propsData,
   data,
   context,
   children
 ) {
   var props = {};
   var propOptions = Ctor.options.props;
   if (isDef(propOptions)) {
     for (var key in propOptions) {
       props[key] = validateProp(key, propOptions, propsData || {});
     }
   } else {
     if (isDef(data.attrs)) { mergeProps(props, data.attrs); }
     if (isDef(data.props)) { mergeProps(props, data.props); }
   }
   // ensure the createElement function in functional components
   // gets a unique context - this is necessary for correct named slot check
   var _context = Object.create(context);
   var h = function (a, b, c, d) { return createElement(_context, a, b, c, d, true); };
   var vnode = Ctor.options.render.call(null, h, {
     data: data,
     props: props,
     children: children,
     parent: context,
     listeners: data.on || {},
     injections: resolveInject(Ctor.options.inject, context),
     slots: function () { return resolveSlots(children, context); }
   });
   if (vnode instanceof VNode) {
     vnode.functionalContext = context;
     vnode.functionalOptions = Ctor.options;
     if (data.slot) {
       (vnode.data || (vnode.data = {})).slot = data.slot;
     }
   }
   return vnode
 }
 
 function mergeProps (to, from) {
   for (var key in from) {
     to[camelize(key)] = from[key];
   }
 }
 
 /*  */
 
 // hooks to be invoked on component VNodes during patch
 var componentVNodeHooks = {
   init: function init (
     vnode,
     hydrating,
     parentElm,
     refElm
   ) {
     if (!vnode.componentInstance || vnode.componentInstance._isDestroyed) {
       var child = vnode.componentInstance = createComponentInstanceForVnode(
         vnode,
         activeInstance,
         parentElm,
         refElm
       );
       child.$mount(hydrating ? vnode.elm : undefined, hydrating);
     } else if (vnode.data.keepAlive) {
       // kept-alive components, treat as a patch
       var mountedNode = vnode; // work around flow
       componentVNodeHooks.prepatch(mountedNode, mountedNode);
     }
   },
 
   prepatch: function prepatch (oldVnode, vnode) {
     var options = vnode.componentOptions;
     var child = vnode.componentInstance = oldVnode.componentInstance;
     updateChildComponent(
       child,
       options.propsData, // updated props
       options.listeners, // updated listeners
       vnode, // new parent vnode
       options.children // new children
     );
   },
 
   insert: function insert (vnode) {
     var context = vnode.context;
     var componentInstance = vnode.componentInstance;
     if (!componentInstance._isMounted) {
       componentInstance._isMounted = true;
       callHook(componentInstance, 'mounted');
     }
     if (vnode.data.keepAlive) {
       if (context._isMounted) {
         // vue-router#1212
         // During updates, a kept-alive component's child components may
         // change, so directly walking the tree here may call activated hooks
         // on incorrect children. Instead we push them into a queue which will
         // be processed after the whole patch process ended.
         queueActivatedComponent(componentInstance);
       } else {
         activateChildComponent(componentInstance, true /* direct */);
       }
     }
   },
 
   destroy: function destroy (vnode) {
     var componentInstance = vnode.componentInstance;
     if (!componentInstance._isDestroyed) {
       if (!vnode.data.keepAlive) {
         componentInstance.$destroy();
       } else {
         deactivateChildComponent(componentInstance, true /* direct */);
       }
     }
   }
 };
 
 var hooksToMerge = Object.keys(componentVNodeHooks);
 
 function createComponent (
   Ctor,
   data,
   context,
   children,
   tag
 ) {
   if (isUndef(Ctor)) {
     return
   }
 
   var baseCtor = context.$options._base;
 
   // plain options object: turn it into a constructor
   if (isObject(Ctor)) {
     Ctor = baseCtor.extend(Ctor);
   }
 
   // if at this stage it's not a constructor or an async component factory,
   // reject.
   if (typeof Ctor !== 'function') {
     {
       warn(("Invalid Component definition: " + (String(Ctor))), context);
     }
     return
   }
 
   // async component
   var asyncFactory;
   if (isUndef(Ctor.cid)) {
     asyncFactory = Ctor;
     Ctor = resolveAsyncComponent(asyncFactory, baseCtor, context);
     if (Ctor === undefined) {
       // return a placeholder node for async component, which is rendered
       // as a comment node but preserves all the raw information for the node.
       // the information will be used for async server-rendering and hydration.
       return createAsyncPlaceholder(
         asyncFactory,
         data,
         context,
         children,
         tag
       )
     }
   }
 
   data = data || {};
 
   // resolve constructor options in case global mixins are applied after
   // component constructor creation
   resolveConstructorOptions(Ctor);
 
   // transform component v-model data into props & events
   if (isDef(data.model)) {
     transformModel(Ctor.options, data);
   }
 
   // extract props
   var propsData = extractPropsFromVNodeData(data, Ctor, tag);
 
   // functional component
   if (isTrue(Ctor.options.functional)) {
     return createFunctionalComponent(Ctor, propsData, data, context, children)
   }
 
   // keep listeners
   var listeners = data.on;
 
   if (isTrue(Ctor.options.abstract)) {
     // abstract components do not keep anything
     // other than props & listeners & slot
 
     // work around flow
     var slot = data.slot;
     data = {};
     if (slot) {
       data.slot = slot;
     }
   }
 
   // merge component management hooks onto the placeholder node
   mergeHooks(data);
 
   // return a placeholder vnode
   var name = Ctor.options.name || tag;
   var vnode = new VNode(
     ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
     data, undefined, undefined, undefined, context,
     { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children },
     asyncFactory
   );
   return vnode
 }
 
 function createComponentInstanceForVnode (
   vnode, // we know it's MountedComponentVNode but flow doesn't
   parent, // activeInstance in lifecycle state
   parentElm,
   refElm
 ) {
   var vnodeComponentOptions = vnode.componentOptions;
   var options = {
     _isComponent: true,
     parent: parent,
     propsData: vnodeComponentOptions.propsData,
     _componentTag: vnodeComponentOptions.tag,
     _parentVnode: vnode,
     _parentListeners: vnodeComponentOptions.listeners,
     _renderChildren: vnodeComponentOptions.children,
     _parentElm: parentElm || null,
     _refElm: refElm || null
   };
   // check inline-template render functions
   var inlineTemplate = vnode.data.inlineTemplate;
   if (isDef(inlineTemplate)) {
     options.render = inlineTemplate.render;
     options.staticRenderFns = inlineTemplate.staticRenderFns;
   }
   return new vnodeComponentOptions.Ctor(options)
 }
 
 function mergeHooks (data) {
   if (!data.hook) {
     data.hook = {};
   }
   for (var i = 0; i < hooksToMerge.length; i++) {
     var key = hooksToMerge[i];
     var fromParent = data.hook[key];
     var ours = componentVNodeHooks[key];
     data.hook[key] = fromParent ? mergeHook$1(ours, fromParent) : ours;
   }
 }
 
 function mergeHook$1 (one, two) {
   return function (a, b, c, d) {
     one(a, b, c, d);
     two(a, b, c, d);
   }
 }
 
 // transform component v-model info (value and callback) into
 // prop and event handler respectively.
 function transformModel (options, data) {
   var prop = (options.model && options.model.prop) || 'value';
   var event = (options.model && options.model.event) || 'input';(data.props || (data.props = {}))[prop] = data.model.value;
   var on = data.on || (data.on = {});
   if (isDef(on[event])) {
     on[event] = [data.model.callback].concat(on[event]);
   } else {
     on[event] = data.model.callback;
   }
 }
 
 /*  */
 
 var SIMPLE_NORMALIZE = 1;
 var ALWAYS_NORMALIZE = 2;
 
 // wrapper function for providing a more flexible interface
 // without getting yelled at by flow
 function createElement (
   context,
   tag,
   data,
   children,
   normalizationType,
   alwaysNormalize
 ) {
   if (Array.isArray(data) || isPrimitive(data)) {
     normalizationType = children;
     children = data;
     data = undefined;
   }
   if (isTrue(alwaysNormalize)) {
     normalizationType = ALWAYS_NORMALIZE;
   }
   return _createElement(context, tag, data, children, normalizationType)
 }
 
 function _createElement (
   context,
   tag,
   data,
   children,
   normalizationType
 ) {
   if (isDef(data) && isDef((data).__ob__)) {
     "development" !== 'production' && warn(
       "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
       'Always create fresh vnode data objects in each render!',
       context
     );
     return createEmptyVNode()
   }
   // object syntax in v-bind
   if (isDef(data) && isDef(data.is)) {
     tag = data.is;
   }
   if (!tag) {
     // in case of component :is set to falsy value
     return createEmptyVNode()
   }
   // warn against non-primitive key
   if ("development" !== 'production' &&
     isDef(data) && isDef(data.key) && !isPrimitive(data.key)
   ) {
     warn(
       'Avoid using non-primitive value as key, ' +
       'use string/number value instead.',
       context
     );
   }
   // support single function children as default scoped slot
   if (Array.isArray(children) &&
     typeof children[0] === 'function'
   ) {
     data = data || {};
     data.scopedSlots = { default: children[0] };
     children.length = 0;
   }
   if (normalizationType === ALWAYS_NORMALIZE) {
     children = normalizeChildren(children);
   } else if (normalizationType === SIMPLE_NORMALIZE) {
     children = simpleNormalizeChildren(children);
   }
   var vnode, ns;
   if (typeof tag === 'string') {
     var Ctor;
     ns = config.getTagNamespace(tag);
     if (config.isReservedTag(tag)) {
       // platform built-in elements
       vnode = new VNode(
         config.parsePlatformTagName(tag), data, children,
         undefined, undefined, context
       );
     } else if (isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
       // component
       vnode = createComponent(Ctor, data, context, children, tag);
     } else {
       // unknown or unlisted namespaced elements
       // check at runtime because it may get assigned a namespace when its
       // parent normalizes children
       vnode = new VNode(
         tag, data, children,
         undefined, undefined, context
       );
     }
   } else {
     // direct component options / constructor
     vnode = createComponent(tag, data, context, children);
   }
   if (isDef(vnode)) {
     if (ns) { applyNS(vnode, ns); }
     return vnode
   } else {
     return createEmptyVNode()
   }
 }
 
 function applyNS (vnode, ns) {
   vnode.ns = ns;
   if (vnode.tag === 'foreignObject') {
     // use default namespace inside foreignObject
     return
   }
   if (isDef(vnode.children)) {
     for (var i = 0, l = vnode.children.length; i < l; i++) {
       var child = vnode.children[i];
       if (isDef(child.tag) && isUndef(child.ns)) {
         applyNS(child, ns);
       }
     }
   }
 }
 
 /*  */
 
 /**
  * Runtime helper for rendering v-for lists.
  */
 function renderList (
   val,
   render
 ) {
   var ret, i, l, keys, key;
   if (Array.isArray(val) || typeof val === 'string') {
     ret = new Array(val.length);
     for (i = 0, l = val.length; i < l; i++) {
       ret[i] = render(val[i], i);
     }
   } else if (typeof val === 'number') {
     ret = new Array(val);
     for (i = 0; i < val; i++) {
       ret[i] = render(i + 1, i);
     }
   } else if (isObject(val)) {
     keys = Object.keys(val);
     ret = new Array(keys.length);
     for (i = 0, l = keys.length; i < l; i++) {
       key = keys[i];
       ret[i] = render(val[key], key, i);
     }
   }
   if (isDef(ret)) {
     (ret)._isVList = true;
   }
   return ret
 }
 
 /*  */
 
 /**
  * Runtime helper for rendering <slot>
  */
 function renderSlot (
   name,
   fallback,
   props,
   bindObject
 ) {
   var scopedSlotFn = this.$scopedSlots[name];
   if (scopedSlotFn) { // scoped slot
     props = props || {};
     if (bindObject) {
       props = extend(extend({}, bindObject), props);
     }
     return scopedSlotFn(props) || fallback
   } else {
     var slotNodes = this.$slots[name];
     // warn duplicate slot usage
     if (slotNodes && "development" !== 'production') {
       slotNodes._rendered && warn(
         "Duplicate presence of slot \"" + name + "\" found in the same render tree " +
         "- this will likely cause render errors.",
         this
       );
       slotNodes._rendered = true;
     }
     return slotNodes || fallback
   }
 }
 
 /*  */
 
 /**
  * Runtime helper for resolving filters
  */
 function resolveFilter (id) {
   return resolveAsset(this.$options, 'filters', id, true) || identity
 }
 
 /*  */
 
 /**
  * Runtime helper for checking keyCodes from config.
  */
 function checkKeyCodes (
   eventKeyCode,
   key,
   builtInAlias
 ) {
   var keyCodes = config.keyCodes[key] || builtInAlias;
   if (Array.isArray(keyCodes)) {
     return keyCodes.indexOf(eventKeyCode) === -1
   } else {
     return keyCodes !== eventKeyCode
   }
 }
 
 /*  */
 
 /**
  * Runtime helper for merging v-bind="object" into a VNode's data.
  */
 function bindObjectProps (
   data,
   tag,
   value,
   asProp,
   isSync
 ) {
   if (value) {
     if (!isObject(value)) {
       "development" !== 'production' && warn(
         'v-bind without argument expects an Object or Array value',
         this
       );
     } else {
       if (Array.isArray(value)) {
         value = toObject(value);
       }
       var hash;
       var loop = function ( key ) {
         if (
           key === 'class' ||
           key === 'style' ||
           isReservedAttribute(key)
         ) {
           hash = data;
         } else {
           var type = data.attrs && data.attrs.type;
           hash = asProp || config.mustUseProp(tag, type, key)
             ? data.domProps || (data.domProps = {})
             : data.attrs || (data.attrs = {});
         }
         if (!(key in hash)) {
           hash[key] = value[key];
 
           if (isSync) {
             var on = data.on || (data.on = {});
             on[("update:" + key)] = function ($event) {
               value[key] = $event;
             };
           }
         }
       };
 
       for (var key in value) loop( key );
     }
   }
   return data
 }
 
 /*  */
 
 /**
  * Runtime helper for rendering static trees.
  */
 function renderStatic (
   index,
   isInFor
 ) {
   var tree = this._staticTrees[index];
   // if has already-rendered static tree and not inside v-for,
   // we can reuse the same tree by doing a shallow clone.
   if (tree && !isInFor) {
     return Array.isArray(tree)
       ? cloneVNodes(tree)
       : cloneVNode(tree)
   }
   // otherwise, render a fresh tree.
   tree = this._staticTrees[index] =
     this.$options.staticRenderFns[index].call(this._renderProxy);
   markStatic(tree, ("__static__" + index), false);
   return tree
 }
 
 /**
  * Runtime helper for v-once.
  * Effectively it means marking the node as static with a unique key.
  */
 function markOnce (
   tree,
   index,
   key
 ) {
   markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
   return tree
 }
 
 function markStatic (
   tree,
   key,
   isOnce
 ) {
   if (Array.isArray(tree)) {
     for (var i = 0; i < tree.length; i++) {
       if (tree[i] && typeof tree[i] !== 'string') {
         markStaticNode(tree[i], (key + "_" + i), isOnce);
       }
     }
   } else {
     markStaticNode(tree, key, isOnce);
   }
 }
 
 function markStaticNode (node, key, isOnce) {
   node.isStatic = true;
   node.key = key;
   node.isOnce = isOnce;
 }
 
 /*  */
 
 function bindObjectListeners (data, value) {
   if (value) {
     if (!isPlainObject(value)) {
       "development" !== 'production' && warn(
         'v-on without argument expects an Object value',
         this
       );
     } else {
       var on = data.on = data.on ? extend({}, data.on) : {};
       for (var key in value) {
         var existing = on[key];
         var ours = value[key];
         on[key] = existing ? [].concat(ours, existing) : ours;
       }
     }
   }
   return data
 }
 
 /*  */
 
 function initRender (vm) {
   vm._vnode = null; // the root of the child tree
   vm._staticTrees = null;
   var parentVnode = vm.$vnode = vm.$options._parentVnode; // the placeholder node in parent tree
   var renderContext = parentVnode && parentVnode.context;
   vm.$slots = resolveSlots(vm.$options._renderChildren, renderContext);
   vm.$scopedSlots = emptyObject;
   // bind the createElement fn to this instance
   // so that we get proper render context inside it.
   // args order: tag, data, children, normalizationType, alwaysNormalize
   // internal version is used by render functions compiled from templates
   vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
   // normalization is always applied for the public version, used in
   // user-written render functions.
   vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };
 
   // $attrs & $listeners are exposed for easier HOC creation.
   // they need to be reactive so that HOCs using them are always updated
   var parentData = parentVnode && parentVnode.data;
   /* istanbul ignore else */
   {
     defineReactive$$1(vm, '$attrs', parentData && parentData.attrs, function () {
       !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
     }, true);
     defineReactive$$1(vm, '$listeners', parentData && parentData.on, function () {
       !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
     }, true);
   }
 }
 
 function renderMixin (Vue) {
   Vue.prototype.$nextTick = function (fn) {
     return nextTick(fn, this)
   };
 
   Vue.prototype._render = function () {
     var vm = this;
     var ref = vm.$options;
     var render = ref.render;
     var staticRenderFns = ref.staticRenderFns;
     var _parentVnode = ref._parentVnode;
 
     if (vm._isMounted) {
       // clone slot nodes on re-renders
       for (var key in vm.$slots) {
         vm.$slots[key] = cloneVNodes(vm.$slots[key]);
       }
     }
 
     vm.$scopedSlots = (_parentVnode && _parentVnode.data.scopedSlots) || emptyObject;
 
     if (staticRenderFns && !vm._staticTrees) {
       vm._staticTrees = [];
     }
     // set parent vnode. this allows render functions to have access
     // to the data on the placeholder node.
     vm.$vnode = _parentVnode;
     // render self
     var vnode;
     try {
       vnode = render.call(vm._renderProxy, vm.$createElement);
     } catch (e) {
       handleError(e, vm, "render function");
       // return error render result,
       // or previous vnode to prevent render error causing blank component
       /* istanbul ignore else */
       {
         vnode = vm.$options.renderError
           ? vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e)
           : vm._vnode;
       }
     }
     // return empty vnode in case the render function errored out
     if (!(vnode instanceof VNode)) {
       if ("development" !== 'production' && Array.isArray(vnode)) {
         warn(
           'Multiple root nodes returned from render function. Render function ' +
           'should return a single root node.',
           vm
         );
       }
       vnode = createEmptyVNode();
     }
     // set parent
     vnode.parent = _parentVnode;
     return vnode
   };
 
   // internal render helpers.
   // these are exposed on the instance prototype to reduce generated render
   // code size.
   Vue.prototype._o = markOnce;
   Vue.prototype._n = toNumber;
   Vue.prototype._s = toString;
   Vue.prototype._l = renderList;
   Vue.prototype._t = renderSlot;
   Vue.prototype._q = looseEqual;
   Vue.prototype._i = looseIndexOf;
   Vue.prototype._m = renderStatic;
   Vue.prototype._f = resolveFilter;
   Vue.prototype._k = checkKeyCodes;
   Vue.prototype._b = bindObjectProps;
   Vue.prototype._v = createTextVNode;
   Vue.prototype._e = createEmptyVNode;
   Vue.prototype._u = resolveScopedSlots;
   Vue.prototype._g = bindObjectListeners;
 }
 
 /*  */
 
 var uid$1 = 0;
 
 function initMixin (Vue) {
   Vue.prototype._init = function (options) {
     var vm = this;
     // a uid
     vm._uid = uid$1++;
 
     var startTag, endTag;
     /* istanbul ignore if */
     if ("development" !== 'production' && config.performance && mark) {
       startTag = "vue-perf-init:" + (vm._uid);
       endTag = "vue-perf-end:" + (vm._uid);
       mark(startTag);
     }
 
     // a flag to avoid this being observed
     vm._isVue = true;
     // merge options
     if (options && options._isComponent) {
       // optimize internal component instantiation
       // since dynamic options merging is pretty slow, and none of the
       // internal component options needs special treatment.
       initInternalComponent(vm, options);
     } else {
       vm.$options = mergeOptions(
         resolveConstructorOptions(vm.constructor),
         options || {},
         vm
       );
     }
     /* istanbul ignore else */
     {
       initProxy(vm);
     }
     // expose real self
     vm._self = vm;
     initLifecycle(vm);
     initEvents(vm);
     initRender(vm);
     callHook(vm, 'beforeCreate');
     initInjections(vm); // resolve injections before data/props
     initState(vm);
     initProvide(vm); // resolve provide after data/props
     callHook(vm, 'created');
 
     /* istanbul ignore if */
     if ("development" !== 'production' && config.performance && mark) {
       vm._name = formatComponentName(vm, false);
       mark(endTag);
       measure(((vm._name) + " init"), startTag, endTag);
     }
 
     if (vm.$options.el) {
       vm.$mount(vm.$options.el);
     }
   };
 }
 
 function initInternalComponent (vm, options) {
   var opts = vm.$options = Object.create(vm.constructor.options);
   // doing this because it's faster than dynamic enumeration.
   opts.parent = options.parent;
   opts.propsData = options.propsData;
   opts._parentVnode = options._parentVnode;
   opts._parentListeners = options._parentListeners;
   opts._renderChildren = options._renderChildren;
   opts._componentTag = options._componentTag;
   opts._parentElm = options._parentElm;
   opts._refElm = options._refElm;
   if (options.render) {
     opts.render = options.render;
     opts.staticRenderFns = options.staticRenderFns;
   }
 }
 
 function resolveConstructorOptions (Ctor) {
   var options = Ctor.options;
   if (Ctor.super) {
     var superOptions = resolveConstructorOptions(Ctor.super);
     var cachedSuperOptions = Ctor.superOptions;
     if (superOptions !== cachedSuperOptions) {
       // super option changed,
       // need to resolve new options.
       Ctor.superOptions = superOptions;
       // check if there are any late-modified/attached options (#4976)
       var modifiedOptions = resolveModifiedOptions(Ctor);
       // update base extend options
       if (modifiedOptions) {
         extend(Ctor.extendOptions, modifiedOptions);
       }
       options = Ctor.options = mergeOptions(superOptions, Ctor.extendOptions);
       if (options.name) {
         options.components[options.name] = Ctor;
       }
     }
   }
   return options
 }
 
 function resolveModifiedOptions (Ctor) {
   var modified;
   var latest = Ctor.options;
   var extended = Ctor.extendOptions;
   var sealed = Ctor.sealedOptions;
   for (var key in latest) {
     if (latest[key] !== sealed[key]) {
       if (!modified) { modified = {}; }
       modified[key] = dedupe(latest[key], extended[key], sealed[key]);
     }
   }
   return modified
 }
 
 function dedupe (latest, extended, sealed) {
   // compare latest and sealed to ensure lifecycle hooks won't be duplicated
   // between merges
   if (Array.isArray(latest)) {
     var res = [];
     sealed = Array.isArray(sealed) ? sealed : [sealed];
     extended = Array.isArray(extended) ? extended : [extended];
     for (var i = 0; i < latest.length; i++) {
       // push original options and not sealed options to exclude duplicated options
       if (extended.indexOf(latest[i]) >= 0 || sealed.indexOf(latest[i]) < 0) {
         res.push(latest[i]);
       }
     }
     return res
   } else {
     return latest
   }
 }
 
 function Vue$3 (options) {
   if ("development" !== 'production' &&
     !(this instanceof Vue$3)
   ) {
     warn('Vue is a constructor and should be called with the `new` keyword');
   }
   this._init(options);
 }
 
 initMixin(Vue$3);
 stateMixin(Vue$3);
 eventsMixin(Vue$3);
 lifecycleMixin(Vue$3);
 renderMixin(Vue$3);
 
 /*  */
 
 function initUse (Vue) {
   Vue.use = function (plugin) {
     var installedPlugins = (this._installedPlugins || (this._installedPlugins = []));
     if (installedPlugins.indexOf(plugin) > -1) {
       return this
     }
 
     // additional parameters
     var args = toArray(arguments, 1);
     args.unshift(this);
     if (typeof plugin.install === 'function') {
       plugin.install.apply(plugin, args);
     } else if (typeof plugin === 'function') {
       plugin.apply(null, args);
     }
     installedPlugins.push(plugin);
     return this
   };
 }
 
 /*  */
 
 function initMixin$1 (Vue) {
   Vue.mixin = function (mixin) {
     this.options = mergeOptions(this.options, mixin);
     return this
   };
 }
 
 /*  */
 
 function initExtend (Vue) {
   /**
    * Each instance constructor, including Vue, has a unique
    * cid. This enables us to create wrapped "child
    * constructors" for prototypal inheritance and cache them.
    */
   Vue.cid = 0;
   var cid = 1;
 
   /**
    * Class inheritance
    */
   Vue.extend = function (extendOptions) {
     extendOptions = extendOptions || {};
     var Super = this;
     var SuperId = Super.cid;
     var cachedCtors = extendOptions._Ctor || (extendOptions._Ctor = {});
     if (cachedCtors[SuperId]) {
       return cachedCtors[SuperId]
     }
 
     var name = extendOptions.name || Super.options.name;
     {
       if (!/^[a-zA-Z][\w-]*$/.test(name)) {
         warn(
           'Invalid component name: "' + name + '". Component names ' +
           'can only contain alphanumeric characters and the hyphen, ' +
           'and must start with a letter.'
         );
       }
     }
 
     var Sub = function VueComponent (options) {
       this._init(options);
     };
     Sub.prototype = Object.create(Super.prototype);
     Sub.prototype.constructor = Sub;
     Sub.cid = cid++;
     Sub.options = mergeOptions(
       Super.options,
       extendOptions
     );
     Sub['super'] = Super;
 
     // For props and computed properties, we define the proxy getters on
     // the Vue instances at extension time, on the extended prototype. This
     // avoids Object.defineProperty calls for each instance created.
     if (Sub.options.props) {
       initProps$1(Sub);
     }
     if (Sub.options.computed) {
       initComputed$1(Sub);
     }
 
     // allow further extension/mixin/plugin usage
     Sub.extend = Super.extend;
     Sub.mixin = Super.mixin;
     Sub.use = Super.use;
 
     // create asset registers, so extended classes
     // can have their private assets too.
     ASSET_TYPES.forEach(function (type) {
       Sub[type] = Super[type];
     });
     // enable recursive self-lookup
     if (name) {
       Sub.options.components[name] = Sub;
     }
 
     // keep a reference to the super options at extension time.
     // later at instantiation we can check if Super's options have
     // been updated.
     Sub.superOptions = Super.options;
     Sub.extendOptions = extendOptions;
     Sub.sealedOptions = extend({}, Sub.options);
 
     // cache constructor
     cachedCtors[SuperId] = Sub;
     return Sub
   };
 }
 
 function initProps$1 (Comp) {
   var props = Comp.options.props;
   for (var key in props) {
     proxy(Comp.prototype, "_props", key);
   }
 }
 
 function initComputed$1 (Comp) {
   var computed = Comp.options.computed;
   for (var key in computed) {
     defineComputed(Comp.prototype, key, computed[key]);
   }
 }
 
 /*  */
 
 function initAssetRegisters (Vue) {
   /**
    * Create asset registration methods.
    */
   ASSET_TYPES.forEach(function (type) {
     Vue[type] = function (
       id,
       definition
     ) {
       if (!definition) {
         return this.options[type + 's'][id]
       } else {
         /* istanbul ignore if */
         {
           if (type === 'component' && config.isReservedTag(id)) {
             warn(
               'Do not use built-in or reserved HTML elements as component ' +
               'id: ' + id
             );
           }
         }
         if (type === 'component' && isPlainObject(definition)) {
           definition.name = definition.name || id;
           definition = this.options._base.extend(definition);
         }
         if (type === 'directive' && typeof definition === 'function') {
           definition = { bind: definition, update: definition };
         }
         this.options[type + 's'][id] = definition;
         return definition
       }
     };
   });
 }
 
 /*  */
 
 var patternTypes = [String, RegExp, Array];
 
 function getComponentName (opts) {
   return opts && (opts.Ctor.options.name || opts.tag)
 }
 
 function matches (pattern, name) {
   if (Array.isArray(pattern)) {
     return pattern.indexOf(name) > -1
   } else if (typeof pattern === 'string') {
     return pattern.split(',').indexOf(name) > -1
   } else if (isRegExp(pattern)) {
     return pattern.test(name)
   }
   /* istanbul ignore next */
   return false
 }
 
 function pruneCache (cache, current, filter) {
   for (var key in cache) {
     var cachedNode = cache[key];
     if (cachedNode) {
       var name = getComponentName(cachedNode.componentOptions);
       if (name && !filter(name)) {
         if (cachedNode !== current) {
           pruneCacheEntry(cachedNode);
         }
         cache[key] = null;
       }
     }
   }
 }
 
 function pruneCacheEntry (vnode) {
   if (vnode) {
     vnode.componentInstance.$destroy();
   }
 }
 
 var KeepAlive = {
   name: 'keep-alive',
   abstract: true,
 
   props: {
     include: patternTypes,
     exclude: patternTypes
   },
 
   created: function created () {
     this.cache = Object.create(null);
   },
 
   destroyed: function destroyed () {
     var this$1 = this;
 
     for (var key in this$1.cache) {
       pruneCacheEntry(this$1.cache[key]);
     }
   },
 
   watch: {
     include: function include (val) {
       pruneCache(this.cache, this._vnode, function (name) { return matches(val, name); });
     },
     exclude: function exclude (val) {
       pruneCache(this.cache, this._vnode, function (name) { return !matches(val, name); });
     }
   },
 
   render: function render () {
     var vnode = getFirstComponentChild(this.$slots.default);
     var componentOptions = vnode && vnode.componentOptions;
     if (componentOptions) {
       // check pattern
       var name = getComponentName(componentOptions);
       if (name && (
         (this.include && !matches(this.include, name)) ||
         (this.exclude && matches(this.exclude, name))
       )) {
         return vnode
       }
       var key = vnode.key == null
         // same constructor may get registered as different local components
         // so cid alone is not enough (#3269)
         ? componentOptions.Ctor.cid + (componentOptions.tag ? ("::" + (componentOptions.tag)) : '')
         : vnode.key;
       if (this.cache[key]) {
         vnode.componentInstance = this.cache[key].componentInstance;
       } else {
         this.cache[key] = vnode;
       }
       vnode.data.keepAlive = true;
     }
     return vnode
   }
 };
 
 var builtInComponents = {
   KeepAlive: KeepAlive
 };
 
 /*  */
 
 function initGlobalAPI (Vue) {
   // config
   var configDef = {};
   configDef.get = function () { return config; };
   {
     configDef.set = function () {
       warn(
         'Do not replace the Vue.config object, set individual fields instead.'
       );
     };
   }
   Object.defineProperty(Vue, 'config', configDef);
 
   // exposed util methods.
   // NOTE: these are not considered part of the public API - avoid relying on
   // them unless you are aware of the risk.
   Vue.util = {
     warn: warn,
     extend: extend,
     mergeOptions: mergeOptions,
     defineReactive: defineReactive$$1
   };
 
   Vue.set = set;
   Vue.delete = del;
   Vue.nextTick = nextTick;
 
   Vue.options = Object.create(null);
   ASSET_TYPES.forEach(function (type) {
     Vue.options[type + 's'] = Object.create(null);
   });
 
   // this is used to identify the "base" constructor to extend all plain-object
   // components with in Weex's multi-instance scenarios.
   Vue.options._base = Vue;
 
   extend(Vue.options.components, builtInComponents);
 
   initUse(Vue);
   initMixin$1(Vue);
   initExtend(Vue);
   initAssetRegisters(Vue);
 }
 
 initGlobalAPI(Vue$3);
 
 Object.defineProperty(Vue$3.prototype, '$isServer', {
   get: isServerRendering
 });
 
 Object.defineProperty(Vue$3.prototype, '$ssrContext', {
   get: function get () {
     /* istanbul ignore next */
     return this.$vnode && this.$vnode.ssrContext
   }
 });
 
 Vue$3.version = '2.4.0';
 
 /*  */
 
 // these are reserved for web because they are directly compiled away
 // during template compilation
 var isReservedAttr = makeMap('style,class');
 
 // attributes that should be using props for binding
 var acceptValue = makeMap('input,textarea,option,select');
 var mustUseProp = function (tag, type, attr) {
   return (
     (attr === 'value' && acceptValue(tag)) && type !== 'button' ||
     (attr === 'selected' && tag === 'option') ||
     (attr === 'checked' && tag === 'input') ||
     (attr === 'muted' && tag === 'video')
   )
 };
 
 var isEnumeratedAttr = makeMap('contenteditable,draggable,spellcheck');
 
 var isBooleanAttr = makeMap(
   'allowfullscreen,async,autofocus,autoplay,checked,compact,controls,declare,' +
   'default,defaultchecked,defaultmuted,defaultselected,defer,disabled,' +
   'enabled,formnovalidate,hidden,indeterminate,inert,ismap,itemscope,loop,multiple,' +
   'muted,nohref,noresize,noshade,novalidate,nowrap,open,pauseonexit,readonly,' +
   'required,reversed,scoped,seamless,selected,sortable,translate,' +
   'truespeed,typemustmatch,visible'
 );
 
 var xlinkNS = 'http://www.w3.org/1999/xlink';
 
 var isXlink = function (name) {
   return name.charAt(5) === ':' && name.slice(0, 5) === 'xlink'
 };
 
 var getXlinkProp = function (name) {
   return isXlink(name) ? name.slice(6, name.length) : ''
 };
 
 var isFalsyAttrValue = function (val) {
   return val == null || val === false
 };
 
 /*  */
 
 function genClassForVnode (vnode) {
   var data = vnode.data;
   var parentNode = vnode;
   var childNode = vnode;
   while (isDef(childNode.componentInstance)) {
     childNode = childNode.componentInstance._vnode;
     if (childNode.data) {
       data = mergeClassData(childNode.data, data);
     }
   }
   while (isDef(parentNode = parentNode.parent)) {
     if (parentNode.data) {
       data = mergeClassData(data, parentNode.data);
     }
   }
   return renderClass(data.staticClass, data.class)
 }
 
 function mergeClassData (child, parent) {
   return {
     staticClass: concat(child.staticClass, parent.staticClass),
     class: isDef(child.class)
       ? [child.class, parent.class]
       : parent.class
   }
 }
 
 function renderClass (
   staticClass,
   dynamicClass
 ) {
   if (isDef(staticClass) || isDef(dynamicClass)) {
     return concat(staticClass, stringifyClass(dynamicClass))
   }
   /* istanbul ignore next */
   return ''
 }
 
 function concat (a, b) {
   return a ? b ? (a + ' ' + b) : a : (b || '')
 }
 
 function stringifyClass (value) {
   if (Array.isArray(value)) {
     return stringifyArray(value)
   }
   if (isObject(value)) {
     return stringifyObject(value)
   }
   if (typeof value === 'string') {
     return value
   }
   /* istanbul ignore next */
   return ''
 }
 
 function stringifyArray (value) {
   var res = '';
   var stringified;
   for (var i = 0, l = value.length; i < l; i++) {
     if (isDef(stringified = stringifyClass(value[i])) && stringified !== '') {
       if (res) { res += ' '; }
       res += stringified;
     }
   }
   return res
 }
 
 function stringifyObject (value) {
   var res = '';
   for (var key in value) {
     if (value[key]) {
       if (res) { res += ' '; }
       res += key;
     }
   }
   return res
 }
 
 /*  */
 
 var namespaceMap = {
   svg: 'http://www.w3.org/2000/svg',
   math: 'http://www.w3.org/1998/Math/MathML'
 };
 
 var isHTMLTag = makeMap(
   'html,body,base,head,link,meta,style,title,' +
   'address,article,aside,footer,header,h1,h2,h3,h4,h5,h6,hgroup,nav,section,' +
   'div,dd,dl,dt,figcaption,figure,picture,hr,img,li,main,ol,p,pre,ul,' +
   'a,b,abbr,bdi,bdo,br,cite,code,data,dfn,em,i,kbd,mark,q,rp,rt,rtc,ruby,' +
   's,samp,small,span,strong,sub,sup,time,u,var,wbr,area,audio,map,track,video,' +
   'embed,object,param,source,canvas,script,noscript,del,ins,' +
   'caption,col,colgroup,table,thead,tbody,td,th,tr,' +
   'button,datalist,fieldset,form,input,label,legend,meter,optgroup,option,' +
   'output,progress,select,textarea,' +
   'details,dialog,menu,menuitem,summary,' +
   'content,element,shadow,template,blockquote,iframe,tfoot'
 );
 
 // this map is intentionally selective, only covering SVG elements that may
 // contain child elements.
 var isSVG = makeMap(
   'svg,animate,circle,clippath,cursor,defs,desc,ellipse,filter,font-face,' +
   'foreignObject,g,glyph,image,line,marker,mask,missing-glyph,path,pattern,' +
   'polygon,polyline,rect,switch,symbol,text,textpath,tspan,use,view',
   true
 );
 
 var isPreTag = function (tag) { return tag === 'pre'; };
 
 var isReservedTag = function (tag) {
   return isHTMLTag(tag) || isSVG(tag)
 };
 
 function getTagNamespace (tag) {
   if (isSVG(tag)) {
     return 'svg'
   }
   // basic support for MathML
   // note it doesn't support other MathML elements being component roots
   if (tag === 'math') {
     return 'math'
   }
 }
 
 var unknownElementCache = Object.create(null);
 function isUnknownElement (tag) {
   /* istanbul ignore if */
   if (!inBrowser) {
     return true
   }
   if (isReservedTag(tag)) {
     return false
   }
   tag = tag.toLowerCase();
   /* istanbul ignore if */
   if (unknownElementCache[tag] != null) {
     return unknownElementCache[tag]
   }
   var el = document.createElement(tag);
   if (tag.indexOf('-') > -1) {
     // http://stackoverflow.com/a/28210364/1070244
     return (unknownElementCache[tag] = (
       el.constructor === window.HTMLUnknownElement ||
       el.constructor === window.HTMLElement
     ))
   } else {
     return (unknownElementCache[tag] = /HTMLUnknownElement/.test(el.toString()))
   }
 }
 
 /*  */
 
 /**
  * Query an element selector if it's not an element already.
  */
 function query (el) {
   if (typeof el === 'string') {
     var selected = document.querySelector(el);
     if (!selected) {
       "development" !== 'production' && warn(
         'Cannot find element: ' + el
       );
       return document.createElement('div')
     }
     return selected
   } else {
     return el
   }
 }
 
 /*  */
 
 function createElement$1 (tagName, vnode) {
   var elm = document.createElement(tagName);
   if (tagName !== 'select') {
     return elm
   }
   // false or null will remove the attribute but undefined will not
   if (vnode.data && vnode.data.attrs && vnode.data.attrs.multiple !== undefined) {
     elm.setAttribute('multiple', 'multiple');
   }
   return elm
 }
 
 function createElementNS (namespace, tagName) {
   return document.createElementNS(namespaceMap[namespace], tagName)
 }
 
 function createTextNode (text) {
   return document.createTextNode(text)
 }
 
 function createComment (text) {
   return document.createComment(text)
 }
 
 function insertBefore (parentNode, newNode, referenceNode) {
   parentNode.insertBefore(newNode, referenceNode);
 }
 
 function removeChild (node, child) {
   node.removeChild(child);
 }
 
 function appendChild (node, child) {
   node.appendChild(child);
 }
 
 function parentNode (node) {
   return node.parentNode
 }
 
 function nextSibling (node) {
   return node.nextSibling
 }
 
 function tagName (node) {
   return node.tagName
 }
 
 function setTextContent (node, text) {
   node.textContent = text;
 }
 
 function setAttribute (node, key, val) {
   node.setAttribute(key, val);
 }
 
 
 var nodeOps = Object.freeze({
    createElement: createElement$1,
    createElementNS: createElementNS,
    createTextNode: createTextNode,
    createComment: createComment,
    insertBefore: insertBefore,
    removeChild: removeChild,
    appendChild: appendChild,
    parentNode: parentNode,
    nextSibling: nextSibling,
    tagName: tagName,
    setTextContent: setTextContent,
    setAttribute: setAttribute
 });
 
 /*  */
 
 var ref = {
   create: function create (_, vnode) {
     registerRef(vnode);
   },
   update: function update (oldVnode, vnode) {
     if (oldVnode.data.ref !== vnode.data.ref) {
       registerRef(oldVnode, true);
       registerRef(vnode);
     }
   },
   destroy: function destroy (vnode) {
     registerRef(vnode, true);
   }
 };
 
 function registerRef (vnode, isRemoval) {
   var key = vnode.data.ref;
   if (!key) { return }
 
   var vm = vnode.context;
   var ref = vnode.componentInstance || vnode.elm;
   var refs = vm.$refs;
   if (isRemoval) {
     if (Array.isArray(refs[key])) {
       remove(refs[key], ref);
     } else if (refs[key] === ref) {
       refs[key] = undefined;
     }
   } else {
     if (vnode.data.refInFor) {
       if (!Array.isArray(refs[key])) {
         refs[key] = [ref];
       } else if (refs[key].indexOf(ref) < 0) {
         // $flow-disable-line
         refs[key].push(ref);
       }
     } else {
       refs[key] = ref;
     }
   }
 }
 
 /**
  * Virtual DOM patching algorithm based on Snabbdom by
  * Simon Friis Vindum (@paldepind)
  * Licensed under the MIT License
  * https://github.com/paldepind/snabbdom/blob/master/LICENSE
  *
  * modified by Evan You (@yyx990803)
  *
 
 /*
  * Not type-checking this because this file is perf-critical and the cost
  * of making flow understand it is not worth it.
  */
 
 var emptyNode = new VNode('', {}, []);
 
 var hooks = ['create', 'activate', 'update', 'remove', 'destroy'];
 
 function sameVnode (a, b) {
   return (
     a.key === b.key && (
       (
         a.tag === b.tag &&
         a.isComment === b.isComment &&
         isDef(a.data) === isDef(b.data) &&
         sameInputType(a, b)
       ) || (
         isTrue(a.isAsyncPlaceholder) &&
         a.asyncFactory === b.asyncFactory &&
         isUndef(b.asyncFactory.error)
       )
     )
   )
 }
 
 // Some browsers do not support dynamically changing type for <input>
 // so they need to be treated as different nodes
 function sameInputType (a, b) {
   if (a.tag !== 'input') { return true }
   var i;
   var typeA = isDef(i = a.data) && isDef(i = i.attrs) && i.type;
   var typeB = isDef(i = b.data) && isDef(i = i.attrs) && i.type;
   return typeA === typeB
 }
 
 function createKeyToOldIdx (children, beginIdx, endIdx) {
   var i, key;
   var map = {};
   for (i = beginIdx; i <= endIdx; ++i) {
     key = children[i].key;
     if (isDef(key)) { map[key] = i; }
   }
   return map
 }
 
 function createPatchFunction (backend) {
   var i, j;
   var cbs = {};
 
   var modules = backend.modules;
   var nodeOps = backend.nodeOps;
 
   for (i = 0; i < hooks.length; ++i) {
     cbs[hooks[i]] = [];
     for (j = 0; j < modules.length; ++j) {
       if (isDef(modules[j][hooks[i]])) {
         cbs[hooks[i]].push(modules[j][hooks[i]]);
       }
     }
   }
 
   function emptyNodeAt (elm) {
     return new VNode(nodeOps.tagName(elm).toLowerCase(), {}, [], undefined, elm)
   }
 
   function createRmCb (childElm, listeners) {
     function remove$$1 () {
       if (--remove$$1.listeners === 0) {
         removeNode(childElm);
       }
     }
     remove$$1.listeners = listeners;
     return remove$$1
   }
 
   function removeNode (el) {
     var parent = nodeOps.parentNode(el);
     // element may have already been removed due to v-html / v-text
     if (isDef(parent)) {
       nodeOps.removeChild(parent, el);
     }
   }
 
   var inPre = 0;
   function createElm (vnode, insertedVnodeQueue, parentElm, refElm, nested) {
     vnode.isRootInsert = !nested; // for transition enter check
     if (createComponent(vnode, insertedVnodeQueue, parentElm, refElm)) {
       return
     }
 
     var data = vnode.data;
     var children = vnode.children;
     var tag = vnode.tag;
     if (isDef(tag)) {
       {
         if (data && data.pre) {
           inPre++;
         }
         if (
           !inPre &&
           !vnode.ns &&
           !(config.ignoredElements.length && config.ignoredElements.indexOf(tag) > -1) &&
           config.isUnknownElement(tag)
         ) {
           warn(
             'Unknown custom element: <' + tag + '> - did you ' +
             'register the component correctly? For recursive components, ' +
             'make sure to provide the "name" option.',
             vnode.context
           );
         }
       }
       vnode.elm = vnode.ns
         ? nodeOps.createElementNS(vnode.ns, tag)
         : nodeOps.createElement(tag, vnode);
       setScope(vnode);
 
       /* istanbul ignore if */
       {
         createChildren(vnode, children, insertedVnodeQueue);
         if (isDef(data)) {
           invokeCreateHooks(vnode, insertedVnodeQueue);
         }
         insert(parentElm, vnode.elm, refElm);
       }
 
       if ("development" !== 'production' && data && data.pre) {
         inPre--;
       }
     } else if (isTrue(vnode.isComment)) {
       vnode.elm = nodeOps.createComment(vnode.text);
       insert(parentElm, vnode.elm, refElm);
     } else {
       vnode.elm = nodeOps.createTextNode(vnode.text);
       insert(parentElm, vnode.elm, refElm);
     }
   }
 
   function createComponent (vnode, insertedVnodeQueue, parentElm, refElm) {
     var i = vnode.data;
     if (isDef(i)) {
       var isReactivated = isDef(vnode.componentInstance) && i.keepAlive;
       if (isDef(i = i.hook) && isDef(i = i.init)) {
         i(vnode, false /* hydrating */, parentElm, refElm);
       }
       // after calling the init hook, if the vnode is a child component
       // it should've created a child instance and mounted it. the child
       // component also has set the placeholder vnode's elm.
       // in that case we can just return the element and be done.
       if (isDef(vnode.componentInstance)) {
         initComponent(vnode, insertedVnodeQueue);
         if (isTrue(isReactivated)) {
           reactivateComponent(vnode, insertedVnodeQueue, parentElm, refElm);
         }
         return true
       }
     }
   }
 
   function initComponent (vnode, insertedVnodeQueue) {
     if (isDef(vnode.data.pendingInsert)) {
       insertedVnodeQueue.push.apply(insertedVnodeQueue, vnode.data.pendingInsert);
       vnode.data.pendingInsert = null;
     }
     vnode.elm = vnode.componentInstance.$el;
     if (isPatchable(vnode)) {
       invokeCreateHooks(vnode, insertedVnodeQueue);
       setScope(vnode);
     } else {
       // empty component root.
       // skip all element-related modules except for ref (#3455)
       registerRef(vnode);
       // make sure to invoke the insert hook
       insertedVnodeQueue.push(vnode);
     }
   }
 
   function reactivateComponent (vnode, insertedVnodeQueue, parentElm, refElm) {
     var i;
     // hack for #4339: a reactivated component with inner transition
     // does not trigger because the inner node's created hooks are not called
     // again. It's not ideal to involve module-specific logic in here but
     // there doesn't seem to be a better way to do it.
     var innerNode = vnode;
     while (innerNode.componentInstance) {
       innerNode = innerNode.componentInstance._vnode;
       if (isDef(i = innerNode.data) && isDef(i = i.transition)) {
         for (i = 0; i < cbs.activate.length; ++i) {
           cbs.activate[i](emptyNode, innerNode);
         }
         insertedVnodeQueue.push(innerNode);
         break
       }
     }
     // unlike a newly created component,
     // a reactivated keep-alive component doesn't insert itself
     insert(parentElm, vnode.elm, refElm);
   }
 
   function insert (parent, elm, ref$$1) {
     if (isDef(parent)) {
       if (isDef(ref$$1)) {
         if (ref$$1.parentNode === parent) {
           nodeOps.insertBefore(parent, elm, ref$$1);
         }
       } else {
         nodeOps.appendChild(parent, elm);
       }
     }
   }
 
   function createChildren (vnode, children, insertedVnodeQueue) {
     if (Array.isArray(children)) {
       for (var i = 0; i < children.length; ++i) {
         createElm(children[i], insertedVnodeQueue, vnode.elm, null, true);
       }
     } else if (isPrimitive(vnode.text)) {
       nodeOps.appendChild(vnode.elm, nodeOps.createTextNode(vnode.text));
     }
   }
 
   function isPatchable (vnode) {
     while (vnode.componentInstance) {
       vnode = vnode.componentInstance._vnode;
     }
     return isDef(vnode.tag)
   }
 
   function invokeCreateHooks (vnode, insertedVnodeQueue) {
     for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
       cbs.create[i$1](emptyNode, vnode);
     }
     i = vnode.data.hook; // Reuse variable
     if (isDef(i)) {
       if (isDef(i.create)) { i.create(emptyNode, vnode); }
       if (isDef(i.insert)) { insertedVnodeQueue.push(vnode); }
     }
   }
 
   // set scope id attribute for scoped CSS.
   // this is implemented as a special case to avoid the overhead
   // of going through the normal attribute patching process.
   function setScope (vnode) {
     var i;
     var ancestor = vnode;
     while (ancestor) {
       if (isDef(i = ancestor.context) && isDef(i = i.$options._scopeId)) {
         nodeOps.setAttribute(vnode.elm, i, '');
       }
       ancestor = ancestor.parent;
     }
     // for slot content they should also get the scopeId from the host instance.
     if (isDef(i = activeInstance) &&
       i !== vnode.context &&
       isDef(i = i.$options._scopeId)
     ) {
       nodeOps.setAttribute(vnode.elm, i, '');
     }
   }
 
   function addVnodes (parentElm, refElm, vnodes, startIdx, endIdx, insertedVnodeQueue) {
     for (; startIdx <= endIdx; ++startIdx) {
       createElm(vnodes[startIdx], insertedVnodeQueue, parentElm, refElm);
     }
   }
 
   function invokeDestroyHook (vnode) {
     var i, j;
     var data = vnode.data;
     if (isDef(data)) {
       if (isDef(i = data.hook) && isDef(i = i.destroy)) { i(vnode); }
       for (i = 0; i < cbs.destroy.length; ++i) { cbs.destroy[i](vnode); }
     }
     if (isDef(i = vnode.children)) {
       for (j = 0; j < vnode.children.length; ++j) {
         invokeDestroyHook(vnode.children[j]);
       }
     }
   }
 
   function removeVnodes (parentElm, vnodes, startIdx, endIdx) {
     for (; startIdx <= endIdx; ++startIdx) {
       var ch = vnodes[startIdx];
       if (isDef(ch)) {
         if (isDef(ch.tag)) {
           removeAndInvokeRemoveHook(ch);
           invokeDestroyHook(ch);
         } else { // Text node
           removeNode(ch.elm);
         }
       }
     }
   }
 
   function removeAndInvokeRemoveHook (vnode, rm) {
     if (isDef(rm) || isDef(vnode.data)) {
       var i;
       var listeners = cbs.remove.length + 1;
       if (isDef(rm)) {
         // we have a recursively passed down rm callback
         // increase the listeners count
         rm.listeners += listeners;
       } else {
         // directly removing
         rm = createRmCb(vnode.elm, listeners);
       }
       // recursively invoke hooks on child component root node
       if (isDef(i = vnode.componentInstance) && isDef(i = i._vnode) && isDef(i.data)) {
         removeAndInvokeRemoveHook(i, rm);
       }
       for (i = 0; i < cbs.remove.length; ++i) {
         cbs.remove[i](vnode, rm);
       }
       if (isDef(i = vnode.data.hook) && isDef(i = i.remove)) {
         i(vnode, rm);
       } else {
         rm();
       }
     } else {
       removeNode(vnode.elm);
     }
   }
 
   function updateChildren (parentElm, oldCh, newCh, insertedVnodeQueue, removeOnly) {
     var oldStartIdx = 0;
     var newStartIdx = 0;
     var oldEndIdx = oldCh.length - 1;
     var oldStartVnode = oldCh[0];
     var oldEndVnode = oldCh[oldEndIdx];
     var newEndIdx = newCh.length - 1;
     var newStartVnode = newCh[0];
     var newEndVnode = newCh[newEndIdx];
     var oldKeyToIdx, idxInOld, elmToMove, refElm;
 
     // removeOnly is a special flag used only by <transition-group>
     // to ensure removed elements stay in correct relative positions
     // during leaving transitions
     var canMove = !removeOnly;
 
     while (oldStartIdx <= oldEndIdx && newStartIdx <= newEndIdx) {
       if (isUndef(oldStartVnode)) {
         oldStartVnode = oldCh[++oldStartIdx]; // Vnode has been moved left
       } else if (isUndef(oldEndVnode)) {
         oldEndVnode = oldCh[--oldEndIdx];
       } else if (sameVnode(oldStartVnode, newStartVnode)) {
         patchVnode(oldStartVnode, newStartVnode, insertedVnodeQueue);
         oldStartVnode = oldCh[++oldStartIdx];
         newStartVnode = newCh[++newStartIdx];
       } else if (sameVnode(oldEndVnode, newEndVnode)) {
         patchVnode(oldEndVnode, newEndVnode, insertedVnodeQueue);
         oldEndVnode = oldCh[--oldEndIdx];
         newEndVnode = newCh[--newEndIdx];
       } else if (sameVnode(oldStartVnode, newEndVnode)) { // Vnode moved right
         patchVnode(oldStartVnode, newEndVnode, insertedVnodeQueue);
         canMove && nodeOps.insertBefore(parentElm, oldStartVnode.elm, nodeOps.nextSibling(oldEndVnode.elm));
         oldStartVnode = oldCh[++oldStartIdx];
         newEndVnode = newCh[--newEndIdx];
       } else if (sameVnode(oldEndVnode, newStartVnode)) { // Vnode moved left
         patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue);
         canMove && nodeOps.insertBefore(parentElm, oldEndVnode.elm, oldStartVnode.elm);
         oldEndVnode = oldCh[--oldEndIdx];
         newStartVnode = newCh[++newStartIdx];
       } else {
         if (isUndef(oldKeyToIdx)) { oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx); }
         idxInOld = isDef(newStartVnode.key) ? oldKeyToIdx[newStartVnode.key] : null;
         if (isUndef(idxInOld)) { // New element
           createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm);
           newStartVnode = newCh[++newStartIdx];
         } else {
           elmToMove = oldCh[idxInOld];
           /* istanbul ignore if */
           if ("development" !== 'production' && !elmToMove) {
             warn(
               'It seems there are duplicate keys that is causing an update error. ' +
               'Make sure each v-for item has a unique key.'
             );
           }
           if (sameVnode(elmToMove, newStartVnode)) {
             patchVnode(elmToMove, newStartVnode, insertedVnodeQueue);
             oldCh[idxInOld] = undefined;
             canMove && nodeOps.insertBefore(parentElm, elmToMove.elm, oldStartVnode.elm);
             newStartVnode = newCh[++newStartIdx];
           } else {
             // same key but different element. treat as new element
             createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm);
             newStartVnode = newCh[++newStartIdx];
           }
         }
       }
     }
     if (oldStartIdx > oldEndIdx) {
       refElm = isUndef(newCh[newEndIdx + 1]) ? null : newCh[newEndIdx + 1].elm;
       addVnodes(parentElm, refElm, newCh, newStartIdx, newEndIdx, insertedVnodeQueue);
     } else if (newStartIdx > newEndIdx) {
       removeVnodes(parentElm, oldCh, oldStartIdx, oldEndIdx);
     }
   }
 
   function patchVnode (oldVnode, vnode, insertedVnodeQueue, removeOnly) {
     if (oldVnode === vnode) {
       return
     }
 
     var elm = vnode.elm = oldVnode.elm;
 
     if (isTrue(oldVnode.isAsyncPlaceholder)) {
       if (isDef(vnode.asyncFactory.resolved)) {
         hydrate(oldVnode.elm, vnode, insertedVnodeQueue);
       } else {
         vnode.isAsyncPlaceholder = true;
       }
       return
     }
 
     // reuse element for static trees.
     // note we only do this if the vnode is cloned -
     // if the new node is not cloned it means the render functions have been
     // reset by the hot-reload-api and we need to do a proper re-render.
     if (isTrue(vnode.isStatic) &&
       isTrue(oldVnode.isStatic) &&
       vnode.key === oldVnode.key &&
       (isTrue(vnode.isCloned) || isTrue(vnode.isOnce))
     ) {
       vnode.componentInstance = oldVnode.componentInstance;
       return
     }
 
     var i;
     var data = vnode.data;
     if (isDef(data) && isDef(i = data.hook) && isDef(i = i.prepatch)) {
       i(oldVnode, vnode);
     }
 
     var oldCh = oldVnode.children;
     var ch = vnode.children;
     if (isDef(data) && isPatchable(vnode)) {
       for (i = 0; i < cbs.update.length; ++i) { cbs.update[i](oldVnode, vnode); }
       if (isDef(i = data.hook) && isDef(i = i.update)) { i(oldVnode, vnode); }
     }
     if (isUndef(vnode.text)) {
       if (isDef(oldCh) && isDef(ch)) {
         if (oldCh !== ch) { updateChildren(elm, oldCh, ch, insertedVnodeQueue, removeOnly); }
       } else if (isDef(ch)) {
         if (isDef(oldVnode.text)) { nodeOps.setTextContent(elm, ''); }
         addVnodes(elm, null, ch, 0, ch.length - 1, insertedVnodeQueue);
       } else if (isDef(oldCh)) {
         removeVnodes(elm, oldCh, 0, oldCh.length - 1);
       } else if (isDef(oldVnode.text)) {
         nodeOps.setTextContent(elm, '');
       }
     } else if (oldVnode.text !== vnode.text) {
       nodeOps.setTextContent(elm, vnode.text);
     }
     if (isDef(data)) {
       if (isDef(i = data.hook) && isDef(i = i.postpatch)) { i(oldVnode, vnode); }
     }
   }
 
   function invokeInsertHook (vnode, queue, initial) {
     // delay insert hooks for component root nodes, invoke them after the
     // element is really inserted
     if (isTrue(initial) && isDef(vnode.parent)) {
       vnode.parent.data.pendingInsert = queue;
     } else {
       for (var i = 0; i < queue.length; ++i) {
         queue[i].data.hook.insert(queue[i]);
       }
     }
   }
 
   var bailed = false;
   // list of modules that can skip create hook during hydration because they
   // are already rendered on the client or has no need for initialization
   var isRenderedModule = makeMap('attrs,style,class,staticClass,staticStyle,key');
 
   // Note: this is a browser-only function so we can assume elms are DOM nodes.
   function hydrate (elm, vnode, insertedVnodeQueue) {
     if (isTrue(vnode.isComment) && isDef(vnode.asyncFactory)) {
       vnode.elm = elm;
       vnode.isAsyncPlaceholder = true;
       return true
     }
     {
       if (!assertNodeMatch(elm, vnode)) {
         return false
       }
     }
     vnode.elm = elm;
     var tag = vnode.tag;
     var data = vnode.data;
     var children = vnode.children;
     if (isDef(data)) {
       if (isDef(i = data.hook) && isDef(i = i.init)) { i(vnode, true /* hydrating */); }
       if (isDef(i = vnode.componentInstance)) {
         // child component. it should have hydrated its own tree.
         initComponent(vnode, insertedVnodeQueue);
         return true
       }
     }
     if (isDef(tag)) {
       if (isDef(children)) {
         // empty element, allow client to pick up and populate children
         if (!elm.hasChildNodes()) {
           createChildren(vnode, children, insertedVnodeQueue);
         } else {
           var childrenMatch = true;
           var childNode = elm.firstChild;
           for (var i$1 = 0; i$1 < children.length; i$1++) {
             if (!childNode || !hydrate(childNode, children[i$1], insertedVnodeQueue)) {
               childrenMatch = false;
               break
             }
             childNode = childNode.nextSibling;
           }
           // if childNode is not null, it means the actual childNodes list is
           // longer than the virtual children list.
           if (!childrenMatch || childNode) {
             if ("development" !== 'production' &&
               typeof console !== 'undefined' &&
               !bailed
             ) {
               bailed = true;
               console.warn('Parent: ', elm);
               console.warn('Mismatching childNodes vs. VNodes: ', elm.childNodes, children);
             }
             return false
           }
         }
       }
       if (isDef(data)) {
         for (var key in data) {
           if (!isRenderedModule(key)) {
             invokeCreateHooks(vnode, insertedVnodeQueue);
             break
           }
         }
       }
     } else if (elm.data !== vnode.text) {
       elm.data = vnode.text;
     }
     return true
   }
 
   function assertNodeMatch (node, vnode) {
     if (isDef(vnode.tag)) {
       return (
         vnode.tag.indexOf('vue-component') === 0 ||
         vnode.tag.toLowerCase() === (node.tagName && node.tagName.toLowerCase())
       )
     } else {
       return node.nodeType === (vnode.isComment ? 8 : 3)
     }
   }
 
   return function patch (oldVnode, vnode, hydrating, removeOnly, parentElm, refElm) {
     if (isUndef(vnode)) {
       if (isDef(oldVnode)) { invokeDestroyHook(oldVnode); }
       return
     }
 
     var isInitialPatch = false;
     var insertedVnodeQueue = [];
 
     if (isUndef(oldVnode)) {
       // empty mount (likely as component), create new root element
       isInitialPatch = true;
       createElm(vnode, insertedVnodeQueue, parentElm, refElm);
     } else {
       var isRealElement = isDef(oldVnode.nodeType);
       if (!isRealElement && sameVnode(oldVnode, vnode)) {
         // patch existing root node
         patchVnode(oldVnode, vnode, insertedVnodeQueue, removeOnly);
       } else {
         if (isRealElement) {
           // mounting to a real element
           // check if this is server-rendered content and if we can perform
           // a successful hydration.
           if (oldVnode.nodeType === 1 && oldVnode.hasAttribute(SSR_ATTR)) {
             oldVnode.removeAttribute(SSR_ATTR);
             hydrating = true;
           }
           if (isTrue(hydrating)) {
             if (hydrate(oldVnode, vnode, insertedVnodeQueue)) {
               invokeInsertHook(vnode, insertedVnodeQueue, true);
               return oldVnode
             } else {
               warn(
                 'The client-side rendered virtual DOM tree is not matching ' +
                 'server-rendered content. This is likely caused by incorrect ' +
                 'HTML markup, for example nesting block-level elements inside ' +
                 '<p>, or missing <tbody>. Bailing hydration and performing ' +
                 'full client-side render.'
               );
             }
           }
           // either not server-rendered, or hydration failed.
           // create an empty node and replace it
           oldVnode = emptyNodeAt(oldVnode);
         }
         // replacing existing element
         var oldElm = oldVnode.elm;
         var parentElm$1 = nodeOps.parentNode(oldElm);
         createElm(
           vnode,
           insertedVnodeQueue,
           // extremely rare edge case: do not insert if old element is in a
           // leaving transition. Only happens when combining transition +
           // keep-alive + HOCs. (#4590)
           oldElm._leaveCb ? null : parentElm$1,
           nodeOps.nextSibling(oldElm)
         );
 
         if (isDef(vnode.parent)) {
           // component root element replaced.
           // update parent placeholder node element, recursively
           var ancestor = vnode.parent;
           while (ancestor) {
             ancestor.elm = vnode.elm;
             ancestor = ancestor.parent;
           }
           if (isPatchable(vnode)) {
             for (var i = 0; i < cbs.create.length; ++i) {
               cbs.create[i](emptyNode, vnode.parent);
             }
           }
         }
 
         if (isDef(parentElm$1)) {
           removeVnodes(parentElm$1, [oldVnode], 0, 0);
         } else if (isDef(oldVnode.tag)) {
           invokeDestroyHook(oldVnode);
         }
       }
     }
 
     invokeInsertHook(vnode, insertedVnodeQueue, isInitialPatch);
     return vnode.elm
   }
 }
 
 /*  */
 
 var directives = {
   create: updateDirectives,
   update: updateDirectives,
   destroy: function unbindDirectives (vnode) {
     updateDirectives(vnode, emptyNode);
   }
 };
 
 function updateDirectives (oldVnode, vnode) {
   if (oldVnode.data.directives || vnode.data.directives) {
     _update(oldVnode, vnode);
   }
 }
 
 function _update (oldVnode, vnode) {
   var isCreate = oldVnode === emptyNode;
   var isDestroy = vnode === emptyNode;
   var oldDirs = normalizeDirectives$1(oldVnode.data.directives, oldVnode.context);
   var newDirs = normalizeDirectives$1(vnode.data.directives, vnode.context);
 
   var dirsWithInsert = [];
   var dirsWithPostpatch = [];
 
   var key, oldDir, dir;
   for (key in newDirs) {
     oldDir = oldDirs[key];
     dir = newDirs[key];
     if (!oldDir) {
       // new directive, bind
       callHook$1(dir, 'bind', vnode, oldVnode);
       if (dir.def && dir.def.inserted) {
         dirsWithInsert.push(dir);
       }
     } else {
       // existing directive, update
       dir.oldValue = oldDir.value;
       callHook$1(dir, 'update', vnode, oldVnode);
       if (dir.def && dir.def.componentUpdated) {
         dirsWithPostpatch.push(dir);
       }
     }
   }
 
   if (dirsWithInsert.length) {
     var callInsert = function () {
       for (var i = 0; i < dirsWithInsert.length; i++) {
         callHook$1(dirsWithInsert[i], 'inserted', vnode, oldVnode);
       }
     };
     if (isCreate) {
       mergeVNodeHook(vnode.data.hook || (vnode.data.hook = {}), 'insert', callInsert);
     } else {
       callInsert();
     }
   }
 
   if (dirsWithPostpatch.length) {
     mergeVNodeHook(vnode.data.hook || (vnode.data.hook = {}), 'postpatch', function () {
       for (var i = 0; i < dirsWithPostpatch.length; i++) {
         callHook$1(dirsWithPostpatch[i], 'componentUpdated', vnode, oldVnode);
       }
     });
   }
 
   if (!isCreate) {
     for (key in oldDirs) {
       if (!newDirs[key]) {
         // no longer present, unbind
         callHook$1(oldDirs[key], 'unbind', oldVnode, oldVnode, isDestroy);
       }
     }
   }
 }
 
 var emptyModifiers = Object.create(null);
 
 function normalizeDirectives$1 (
   dirs,
   vm
 ) {
   var res = Object.create(null);
   if (!dirs) {
     return res
   }
   var i, dir;
   for (i = 0; i < dirs.length; i++) {
     dir = dirs[i];
     if (!dir.modifiers) {
       dir.modifiers = emptyModifiers;
     }
     res[getRawDirName(dir)] = dir;
     dir.def = resolveAsset(vm.$options, 'directives', dir.name, true);
   }
   return res
 }
 
 function getRawDirName (dir) {
   return dir.rawName || ((dir.name) + "." + (Object.keys(dir.modifiers || {}).join('.')))
 }
 
 function callHook$1 (dir, hook, vnode, oldVnode, isDestroy) {
   var fn = dir.def && dir.def[hook];
   if (fn) {
     try {
       fn(vnode.elm, dir, vnode, oldVnode, isDestroy);
     } catch (e) {
       handleError(e, vnode.context, ("directive " + (dir.name) + " " + hook + " hook"));
     }
   }
 }
 
 var baseModules = [
   ref,
   directives
 ];
 
 /*  */
 
 function updateAttrs (oldVnode, vnode) {
   var opts = vnode.componentOptions;
   if (isDef(opts) && opts.Ctor.options.inheritAttrs === false) {
     return
   }
   if (isUndef(oldVnode.data.attrs) && isUndef(vnode.data.attrs)) {
     return
   }
   var key, cur, old;
   var elm = vnode.elm;
   var oldAttrs = oldVnode.data.attrs || {};
   var attrs = vnode.data.attrs || {};
   // clone observed objects, as the user probably wants to mutate it
   if (isDef(attrs.__ob__)) {
     attrs = vnode.data.attrs = extend({}, attrs);
   }
 
   for (key in attrs) {
     cur = attrs[key];
     old = oldAttrs[key];
     if (old !== cur) {
       setAttr(elm, key, cur);
     }
   }
   // #4391: in IE9, setting type can reset value for input[type=radio]
   /* istanbul ignore if */
   if (isIE9 && attrs.value !== oldAttrs.value) {
     setAttr(elm, 'value', attrs.value);
   }
   for (key in oldAttrs) {
     if (isUndef(attrs[key])) {
       if (isXlink(key)) {
         elm.removeAttributeNS(xlinkNS, getXlinkProp(key));
       } else if (!isEnumeratedAttr(key)) {
         elm.removeAttribute(key);
       }
     }
   }
 }
 
 function setAttr (el, key, value) {
   if (isBooleanAttr(key)) {
     // set attribute for blank value
     // e.g. <option disabled>Select one</option>
     if (isFalsyAttrValue(value)) {
       el.removeAttribute(key);
     } else {
       el.setAttribute(key, key);
     }
   } else if (isEnumeratedAttr(key)) {
     el.setAttribute(key, isFalsyAttrValue(value) || value === 'false' ? 'false' : 'true');
   } else if (isXlink(key)) {
     if (isFalsyAttrValue(value)) {
       el.removeAttributeNS(xlinkNS, getXlinkProp(key));
     } else {
       el.setAttributeNS(xlinkNS, key, value);
     }
   } else {
     if (isFalsyAttrValue(value)) {
       el.removeAttribute(key);
     } else {
       el.setAttribute(key, value);
     }
   }
 }
 
 var attrs = {
   create: updateAttrs,
   update: updateAttrs
 };
 
 /*  */
 
 function updateClass (oldVnode, vnode) {
   var el = vnode.elm;
   var data = vnode.data;
   var oldData = oldVnode.data;
   if (
     isUndef(data.staticClass) &&
     isUndef(data.class) && (
       isUndef(oldData) || (
         isUndef(oldData.staticClass) &&
         isUndef(oldData.class)
       )
     )
   ) {
     return
   }
 
   var cls = genClassForVnode(vnode);
 
   // handle transition classes
   var transitionClass = el._transitionClasses;
   if (isDef(transitionClass)) {
     cls = concat(cls, stringifyClass(transitionClass));
   }
 
   // set the class
   if (cls !== el._prevClass) {
     el.setAttribute('class', cls);
     el._prevClass = cls;
   }
 }
 
 var klass = {
   create: updateClass,
   update: updateClass
 };
 
 /*  */
 
 var validDivisionCharRE = /[\w).+\-_$\]]/;
 
 function parseFilters (exp) {
   var inSingle = false;
   var inDouble = false;
   var inTemplateString = false;
   var inRegex = false;
   var curly = 0;
   var square = 0;
   var paren = 0;
   var lastFilterIndex = 0;
   var c, prev, i, expression, filters;
 
   for (i = 0; i < exp.length; i++) {
     prev = c;
     c = exp.charCodeAt(i);
     if (inSingle) {
       if (c === 0x27 && prev !== 0x5C) { inSingle = false; }
     } else if (inDouble) {
       if (c === 0x22 && prev !== 0x5C) { inDouble = false; }
     } else if (inTemplateString) {
       if (c === 0x60 && prev !== 0x5C) { inTemplateString = false; }
     } else if (inRegex) {
       if (c === 0x2f && prev !== 0x5C) { inRegex = false; }
     } else if (
       c === 0x7C && // pipe
       exp.charCodeAt(i + 1) !== 0x7C &&
       exp.charCodeAt(i - 1) !== 0x7C &&
       !curly && !square && !paren
     ) {
       if (expression === undefined) {
         // first filter, end of expression
         lastFilterIndex = i + 1;
         expression = exp.slice(0, i).trim();
       } else {
         pushFilter();
       }
     } else {
       switch (c) {
         case 0x22: inDouble = true; break         // "
         case 0x27: inSingle = true; break         // '
         case 0x60: inTemplateString = true; break // `
         case 0x28: paren++; break                 // (
         case 0x29: paren--; break                 // )
         case 0x5B: square++; break                // [
         case 0x5D: square--; break                // ]
         case 0x7B: curly++; break                 // {
         case 0x7D: curly--; break                 // }
       }
       if (c === 0x2f) { // /
         var j = i - 1;
         var p = (void 0);
         // find first non-whitespace prev char
         for (; j >= 0; j--) {
           p = exp.charAt(j);
           if (p !== ' ') { break }
         }
         if (!p || !validDivisionCharRE.test(p)) {
           inRegex = true;
         }
       }
     }
   }
 
   if (expression === undefined) {
     expression = exp.slice(0, i).trim();
   } else if (lastFilterIndex !== 0) {
     pushFilter();
   }
 
   function pushFilter () {
     (filters || (filters = [])).push(exp.slice(lastFilterIndex, i).trim());
     lastFilterIndex = i + 1;
   }
 
   if (filters) {
     for (i = 0; i < filters.length; i++) {
       expression = wrapFilter(expression, filters[i]);
     }
   }
 
   return expression
 }
 
 function wrapFilter (exp, filter) {
   var i = filter.indexOf('(');
   if (i < 0) {
     // _f: resolveFilter
     return ("_f(\"" + filter + "\")(" + exp + ")")
   } else {
     var name = filter.slice(0, i);
     var args = filter.slice(i + 1);
     return ("_f(\"" + name + "\")(" + exp + "," + args)
   }
 }
 
 /*  */
 
 function baseWarn (msg) {
   console.error(("[Vue compiler]: " + msg));
 }
 
 function pluckModuleFunction (
   modules,
   key
 ) {
   return modules
     ? modules.map(function (m) { return m[key]; }).filter(function (_) { return _; })
     : []
 }
 
 function addProp (el, name, value) {
   (el.props || (el.props = [])).push({ name: name, value: value });
 }
 
 function addAttr (el, name, value) {
   (el.attrs || (el.attrs = [])).push({ name: name, value: value });
 }
 
 function addDirective (
   el,
   name,
   rawName,
   value,
   arg,
   modifiers
 ) {
   (el.directives || (el.directives = [])).push({ name: name, rawName: rawName, value: value, arg: arg, modifiers: modifiers });
 }
 
 function addHandler (
   el,
   name,
   value,
   modifiers,
   important,
   warn
 ) {
   // warn prevent and passive modifier
   /* istanbul ignore if */
   if (
     "development" !== 'production' && warn &&
     modifiers && modifiers.prevent && modifiers.passive
   ) {
     warn(
       'passive and prevent can\'t be used together. ' +
       'Passive handler can\'t prevent default event.'
     );
   }
   // check capture modifier
   if (modifiers && modifiers.capture) {
     delete modifiers.capture;
     name = '!' + name; // mark the event as captured
   }
   if (modifiers && modifiers.once) {
     delete modifiers.once;
     name = '~' + name; // mark the event as once
   }
   /* istanbul ignore if */
   if (modifiers && modifiers.passive) {
     delete modifiers.passive;
     name = '&' + name; // mark the event as passive
   }
   var events;
   if (modifiers && modifiers.native) {
     delete modifiers.native;
     events = el.nativeEvents || (el.nativeEvents = {});
   } else {
     events = el.events || (el.events = {});
   }
   var newHandler = { value: value, modifiers: modifiers };
   var handlers = events[name];
   /* istanbul ignore if */
   if (Array.isArray(handlers)) {
     important ? handlers.unshift(newHandler) : handlers.push(newHandler);
   } else if (handlers) {
     events[name] = important ? [newHandler, handlers] : [handlers, newHandler];
   } else {
     events[name] = newHandler;
   }
 }
 
 function getBindingAttr (
   el,
   name,
   getStatic
 ) {
   var dynamicValue =
     getAndRemoveAttr(el, ':' + name) ||
     getAndRemoveAttr(el, 'v-bind:' + name);
   if (dynamicValue != null) {
     return parseFilters(dynamicValue)
   } else if (getStatic !== false) {
     var staticValue = getAndRemoveAttr(el, name);
     if (staticValue != null) {
       return JSON.stringify(staticValue)
     }
   }
 }
 
 function getAndRemoveAttr (el, name) {
   var val;
   if ((val = el.attrsMap[name]) != null) {
     var list = el.attrsList;
     for (var i = 0, l = list.length; i < l; i++) {
       if (list[i].name === name) {
         list.splice(i, 1);
         break
       }
     }
   }
   return val
 }
 
 /*  */
 
 /**
  * Cross-platform code generation for component v-model
  */
 function genComponentModel (
   el,
   value,
   modifiers
 ) {
   var ref = modifiers || {};
   var number = ref.number;
   var trim = ref.trim;
 
   var baseValueExpression = '$$v';
   var valueExpression = baseValueExpression;
   if (trim) {
     valueExpression =
       "(typeof " + baseValueExpression + " === 'string'" +
         "? " + baseValueExpression + ".trim()" +
         ": " + baseValueExpression + ")";
   }
   if (number) {
     valueExpression = "_n(" + valueExpression + ")";
   }
   var assignment = genAssignmentCode(value, valueExpression);
 
   el.model = {
     value: ("(" + value + ")"),
     expression: ("\"" + value + "\""),
     callback: ("function (" + baseValueExpression + ") {" + assignment + "}")
   };
 }
 
 /**
  * Cross-platform codegen helper for generating v-model value assignment code.
  */
 function genAssignmentCode (
   value,
   assignment
 ) {
   var modelRs = parseModel(value);
   if (modelRs.idx === null) {
     return (value + "=" + assignment)
   } else {
     return ("$set(" + (modelRs.exp) + ", " + (modelRs.idx) + ", " + assignment + ")")
   }
 }
 
 /**
  * parse directive model to do the array update transform. a[idx] = val => $$a.splice($$idx, 1, val)
  *
  * for loop possible cases:
  *
  * - test
  * - test[idx]
  * - test[test1[idx]]
  * - test["a"][idx]
  * - xxx.test[a[a].test1[idx]]
  * - test.xxx.a["asa"][test1[idx]]
  *
  */
 
 var len;
 var str;
 var chr;
 var index$1;
 var expressionPos;
 var expressionEndPos;
 
 function parseModel (val) {
   str = val;
   len = str.length;
   index$1 = expressionPos = expressionEndPos = 0;
 
   if (val.indexOf('[') < 0 || val.lastIndexOf(']') < len - 1) {
     return {
       exp: val,
       idx: null
     }
   }
 
   while (!eof()) {
     chr = next();
     /* istanbul ignore if */
     if (isStringStart(chr)) {
       parseString(chr);
     } else if (chr === 0x5B) {
       parseBracket(chr);
     }
   }
 
   return {
     exp: val.substring(0, expressionPos),
     idx: val.substring(expressionPos + 1, expressionEndPos)
   }
 }
 
 function next () {
   return str.charCodeAt(++index$1)
 }
 
 function eof () {
   return index$1 >= len
 }
 
 function isStringStart (chr) {
   return chr === 0x22 || chr === 0x27
 }
 
 function parseBracket (chr) {
   var inBracket = 1;
   expressionPos = index$1;
   while (!eof()) {
     chr = next();
     if (isStringStart(chr)) {
       parseString(chr);
       continue
     }
     if (chr === 0x5B) { inBracket++; }
     if (chr === 0x5D) { inBracket--; }
     if (inBracket === 0) {
       expressionEndPos = index$1;
       break
     }
   }
 }
 
 function parseString (chr) {
   var stringQuote = chr;
   while (!eof()) {
     chr = next();
     if (chr === stringQuote) {
       break
     }
   }
 }
 
 /*  */
 
 var warn$1;
 
 // in some cases, the event used has to be determined at runtime
 // so we used some reserved tokens during compile.
 var RANGE_TOKEN = '__r';
 var CHECKBOX_RADIO_TOKEN = '__c';
 
 function model (
   el,
   dir,
   _warn
 ) {
   warn$1 = _warn;
   var value = dir.value;
   var modifiers = dir.modifiers;
   var tag = el.tag;
   var type = el.attrsMap.type;
 
   {
     var dynamicType = el.attrsMap['v-bind:type'] || el.attrsMap[':type'];
     if (tag === 'input' && dynamicType) {
       warn$1(
         "<input :type=\"" + dynamicType + "\" v-model=\"" + value + "\">:\n" +
         "v-model does not support dynamic input types. Use v-if branches instead."
       );
     }
     // inputs with type="file" are read only and setting the input's
     // value will throw an error.
     if (tag === 'input' && type === 'file') {
       warn$1(
         "<" + (el.tag) + " v-model=\"" + value + "\" type=\"file\">:\n" +
         "File inputs are read only. Use a v-on:change listener instead."
       );
     }
   }
 
   if (el.component) {
     genComponentModel(el, value, modifiers);
     // component v-model doesn't need extra runtime
     return false
   } else if (tag === 'select') {
     genSelect(el, value, modifiers);
   } else if (tag === 'input' && type === 'checkbox') {
     genCheckboxModel(el, value, modifiers);
   } else if (tag === 'input' && type === 'radio') {
     genRadioModel(el, value, modifiers);
   } else if (tag === 'input' || tag === 'textarea') {
     genDefaultModel(el, value, modifiers);
   } else if (!config.isReservedTag(tag)) {
     genComponentModel(el, value, modifiers);
     // component v-model doesn't need extra runtime
     return false
   } else {
     warn$1(
       "<" + (el.tag) + " v-model=\"" + value + "\">: " +
       "v-model is not supported on this element type. " +
       'If you are working with contenteditable, it\'s recommended to ' +
       'wrap a library dedicated for that purpose inside a custom component.'
     );
   }
 
   // ensure runtime directive metadata
   return true
 }
 
 function genCheckboxModel (
   el,
   value,
   modifiers
 ) {
   var number = modifiers && modifiers.number;
   var valueBinding = getBindingAttr(el, 'value') || 'null';
   var trueValueBinding = getBindingAttr(el, 'true-value') || 'true';
   var falseValueBinding = getBindingAttr(el, 'false-value') || 'false';
   addProp(el, 'checked',
     "Array.isArray(" + value + ")" +
       "?_i(" + value + "," + valueBinding + ")>-1" + (
         trueValueBinding === 'true'
           ? (":(" + value + ")")
           : (":_q(" + value + "," + trueValueBinding + ")")
       )
   );
   addHandler(el, CHECKBOX_RADIO_TOKEN,
     "var $$a=" + value + "," +
         '$$el=$event.target,' +
         "$$c=$$el.checked?(" + trueValueBinding + "):(" + falseValueBinding + ");" +
     'if(Array.isArray($$a)){' +
       "var $$v=" + (number ? '_n(' + valueBinding + ')' : valueBinding) + "," +
           '$$i=_i($$a,$$v);' +
       "if($$c){$$i<0&&(" + value + "=$$a.concat($$v))}" +
       "else{$$i>-1&&(" + value + "=$$a.slice(0,$$i).concat($$a.slice($$i+1)))}" +
     "}else{" + (genAssignmentCode(value, '$$c')) + "}",
     null, true
   );
 }
 
 function genRadioModel (
     el,
     value,
     modifiers
 ) {
   var number = modifiers && modifiers.number;
   var valueBinding = getBindingAttr(el, 'value') || 'null';
   valueBinding = number ? ("_n(" + valueBinding + ")") : valueBinding;
   addProp(el, 'checked', ("_q(" + value + "," + valueBinding + ")"));
   addHandler(el, CHECKBOX_RADIO_TOKEN, genAssignmentCode(value, valueBinding), null, true);
 }
 
 function genSelect (
     el,
     value,
     modifiers
 ) {
   var number = modifiers && modifiers.number;
   var selectedVal = "Array.prototype.filter" +
     ".call($event.target.options,function(o){return o.selected})" +
     ".map(function(o){var val = \"_value\" in o ? o._value : o.value;" +
     "return " + (number ? '_n(val)' : 'val') + "})";
 
   var assignment = '$event.target.multiple ? $$selectedVal : $$selectedVal[0]';
   var code = "var $$selectedVal = " + selectedVal + ";";
   code = code + " " + (genAssignmentCode(value, assignment));
   addHandler(el, 'change', code, null, true);
 }
 
 function genDefaultModel (
   el,
   value,
   modifiers
 ) {
   var type = el.attrsMap.type;
   var ref = modifiers || {};
   var lazy = ref.lazy;
   var number = ref.number;
   var trim = ref.trim;
   var needCompositionGuard = !lazy && type !== 'range';
   var event = lazy
     ? 'change'
     : type === 'range'
       ? RANGE_TOKEN
       : 'input';
 
   var valueExpression = '$event.target.value';
   if (trim) {
     valueExpression = "$event.target.value.trim()";
   }
   if (number) {
     valueExpression = "_n(" + valueExpression + ")";
   }
 
   var code = genAssignmentCode(value, valueExpression);
   if (needCompositionGuard) {
     code = "if($event.target.composing)return;" + code;
   }
 
   addProp(el, 'value', ("(" + value + ")"));
   addHandler(el, event, code, null, true);
   if (trim || number) {
     addHandler(el, 'blur', '$forceUpdate()');
   }
 }
 
 /*  */
 
 // normalize v-model event tokens that can only be determined at runtime.
 // it's important to place the event as the first in the array because
 // the whole point is ensuring the v-model callback gets called before
 // user-attached handlers.
 function normalizeEvents (on) {
   var event;
   /* istanbul ignore if */
   if (isDef(on[RANGE_TOKEN])) {
     // IE input[type=range] only supports `change` event
     event = isIE ? 'change' : 'input';
     on[event] = [].concat(on[RANGE_TOKEN], on[event] || []);
     delete on[RANGE_TOKEN];
   }
   if (isDef(on[CHECKBOX_RADIO_TOKEN])) {
     // Chrome fires microtasks in between click/change, leads to #4521
     event = isChrome ? 'click' : 'change';
     on[event] = [].concat(on[CHECKBOX_RADIO_TOKEN], on[event] || []);
     delete on[CHECKBOX_RADIO_TOKEN];
   }
 }
 
 var target$1;
 
 function add$1 (
   event,
   handler,
   once$$1,
   capture,
   passive
 ) {
   if (once$$1) {
     var oldHandler = handler;
     var _target = target$1; // save current target element in closure
     handler = function (ev) {
       var res = arguments.length === 1
         ? oldHandler(ev)
         : oldHandler.apply(null, arguments);
       if (res !== null) {
         remove$2(event, handler, capture, _target);
       }
     };
   }
   target$1.addEventListener(
     event,
     handler,
     supportsPassive
       ? { capture: capture, passive: passive }
       : capture
   );
 }
 
 function remove$2 (
   event,
   handler,
   capture,
   _target
 ) {
   (_target || target$1).removeEventListener(event, handler, capture);
 }
 
 function updateDOMListeners (oldVnode, vnode) {
   var isComponentRoot = isDef(vnode.componentOptions);
   var oldOn = isComponentRoot ? oldVnode.data.nativeOn : oldVnode.data.on;
   var on = isComponentRoot ? vnode.data.nativeOn : vnode.data.on;
   if (isUndef(oldOn) && isUndef(on)) {
     return
   }
   on = on || {};
   oldOn = oldOn || {};
   target$1 = vnode.elm;
   normalizeEvents(on);
   updateListeners(on, oldOn, add$1, remove$2, vnode.context);
 }
 
 var events = {
   create: updateDOMListeners,
   update: updateDOMListeners
 };
 
 /*  */
 
 function updateDOMProps (oldVnode, vnode) {
   if (isUndef(oldVnode.data.domProps) && isUndef(vnode.data.domProps)) {
     return
   }
   var key, cur;
   var elm = vnode.elm;
   var oldProps = oldVnode.data.domProps || {};
   var props = vnode.data.domProps || {};
   // clone observed objects, as the user probably wants to mutate it
   if (isDef(props.__ob__)) {
     props = vnode.data.domProps = extend({}, props);
   }
 
   for (key in oldProps) {
     if (isUndef(props[key])) {
       elm[key] = '';
     }
   }
   for (key in props) {
     cur = props[key];
     // ignore children if the node has textContent or innerHTML,
     // as these will throw away existing DOM nodes and cause removal errors
     // on subsequent patches (#3360)
     if (key === 'textContent' || key === 'innerHTML') {
       if (vnode.children) { vnode.children.length = 0; }
       if (cur === oldProps[key]) { continue }
     }
 
     if (key === 'value') {
       // store value as _value as well since
       // non-string values will be stringified
       elm._value = cur;
       // avoid resetting cursor position when value is the same
       var strCur = isUndef(cur) ? '' : String(cur);
       if (shouldUpdateValue(elm, vnode, strCur)) {
         elm.value = strCur;
       }
     } else {
       elm[key] = cur;
     }
   }
 }
 
 // check platforms/web/util/attrs.js acceptValue
 
 
 function shouldUpdateValue (
   elm,
   vnode,
   checkVal
 ) {
   return (!elm.composing && (
     vnode.tag === 'option' ||
     isDirty(elm, checkVal) ||
     isInputChanged(elm, checkVal)
   ))
 }
 
 function isDirty (elm, checkVal) {
   // return true when textbox (.number and .trim) loses focus and its value is
   // not equal to the updated value
   return document.activeElement !== elm && elm.value !== checkVal
 }
 
 function isInputChanged (elm, newVal) {
   var value = elm.value;
   var modifiers = elm._vModifiers; // injected by v-model runtime
   if (isDef(modifiers) && modifiers.number) {
     return toNumber(value) !== toNumber(newVal)
   }
   if (isDef(modifiers) && modifiers.trim) {
     return value.trim() !== newVal.trim()
   }
   return value !== newVal
 }
 
 var domProps = {
   create: updateDOMProps,
   update: updateDOMProps
 };
 
 /*  */
 
 var parseStyleText = cached(function (cssText) {
   var res = {};
   var listDelimiter = /;(?![^(]*\))/g;
   var propertyDelimiter = /:(.+)/;
   cssText.split(listDelimiter).forEach(function (item) {
     if (item) {
       var tmp = item.split(propertyDelimiter);
       tmp.length > 1 && (res[tmp[0].trim()] = tmp[1].trim());
     }
   });
   return res
 });
 
 // merge static and dynamic style data on the same vnode
 function normalizeStyleData (data) {
   var style = normalizeStyleBinding(data.style);
   // static style is pre-processed into an object during compilation
   // and is always a fresh object, so it's safe to merge into it
   return data.staticStyle
     ? extend(data.staticStyle, style)
     : style
 }
 
 // normalize possible array / string values into Object
 function normalizeStyleBinding (bindingStyle) {
   if (Array.isArray(bindingStyle)) {
     return toObject(bindingStyle)
   }
   if (typeof bindingStyle === 'string') {
     return parseStyleText(bindingStyle)
   }
   return bindingStyle
 }
 
 /**
  * parent component style should be after child's
  * so that parent component's style could override it
  */
 function getStyle (vnode, checkChild) {
   var res = {};
   var styleData;
 
   if (checkChild) {
     var childNode = vnode;
     while (childNode.componentInstance) {
       childNode = childNode.componentInstance._vnode;
       if (childNode.data && (styleData = normalizeStyleData(childNode.data))) {
         extend(res, styleData);
       }
     }
   }
 
   if ((styleData = normalizeStyleData(vnode.data))) {
     extend(res, styleData);
   }
 
   var parentNode = vnode;
   while ((parentNode = parentNode.parent)) {
     if (parentNode.data && (styleData = normalizeStyleData(parentNode.data))) {
       extend(res, styleData);
     }
   }
   return res
 }
 
 /*  */
 
 var cssVarRE = /^--/;
 var importantRE = /\s*!important$/;
 var setProp = function (el, name, val) {
   /* istanbul ignore if */
   if (cssVarRE.test(name)) {
     el.style.setProperty(name, val);
   } else if (importantRE.test(val)) {
     el.style.setProperty(name, val.replace(importantRE, ''), 'important');
   } else {
     var normalizedName = normalize(name);
     if (Array.isArray(val)) {
       // Support values array created by autoprefixer, e.g.
       // {display: ["-webkit-box", "-ms-flexbox", "flex"]}
       // Set them one by one, and the browser will only set those it can recognize
       for (var i = 0, len = val.length; i < len; i++) {
         el.style[normalizedName] = val[i];
       }
     } else {
       el.style[normalizedName] = val;
     }
   }
 };
 
 var vendorNames = ['Webkit', 'Moz', 'ms'];
 
 var emptyStyle;
 var normalize = cached(function (prop) {
   emptyStyle = emptyStyle || document.createElement('div').style;
   prop = camelize(prop);
   if (prop !== 'filter' && (prop in emptyStyle)) {
     return prop
   }
   var capName = prop.charAt(0).toUpperCase() + prop.slice(1);
   for (var i = 0; i < vendorNames.length; i++) {
     var name = vendorNames[i] + capName;
     if (name in emptyStyle) {
       return name
     }
   }
 });
 
 function updateStyle (oldVnode, vnode) {
   var data = vnode.data;
   var oldData = oldVnode.data;
 
   if (isUndef(data.staticStyle) && isUndef(data.style) &&
     isUndef(oldData.staticStyle) && isUndef(oldData.style)
   ) {
     return
   }
 
   var cur, name;
   var el = vnode.elm;
   var oldStaticStyle = oldData.staticStyle;
   var oldStyleBinding = oldData.normalizedStyle || oldData.style || {};
 
   // if static style exists, stylebinding already merged into it when doing normalizeStyleData
   var oldStyle = oldStaticStyle || oldStyleBinding;
 
   var style = normalizeStyleBinding(vnode.data.style) || {};
 
   // store normalized style under a different key for next diff
   // make sure to clone it if it's reactive, since the user likley wants
   // to mutate it.
   vnode.data.normalizedStyle = isDef(style.__ob__)
     ? extend({}, style)
     : style;
 
   var newStyle = getStyle(vnode, true);
 
   for (name in oldStyle) {
     if (isUndef(newStyle[name])) {
       setProp(el, name, '');
     }
   }
   for (name in newStyle) {
     cur = newStyle[name];
     if (cur !== oldStyle[name]) {
       // ie9 setting to null has no effect, must use empty string
       setProp(el, name, cur == null ? '' : cur);
     }
   }
 }
 
 var style = {
   create: updateStyle,
   update: updateStyle
 };
 
 /*  */
 
 /**
  * Add class with compatibility for SVG since classList is not supported on
  * SVG elements in IE
  */
 function addClass (el, cls) {
   /* istanbul ignore if */
   if (!cls || !(cls = cls.trim())) {
     return
   }
 
   /* istanbul ignore else */
   if (el.classList) {
     if (cls.indexOf(' ') > -1) {
       cls.split(/\s+/).forEach(function (c) { return el.classList.add(c); });
     } else {
       el.classList.add(cls);
     }
   } else {
     var cur = " " + (el.getAttribute('class') || '') + " ";
     if (cur.indexOf(' ' + cls + ' ') < 0) {
       el.setAttribute('class', (cur + cls).trim());
     }
   }
 }
 
 /**
  * Remove class with compatibility for SVG since classList is not supported on
  * SVG elements in IE
  */
 function removeClass (el, cls) {
   /* istanbul ignore if */
   if (!cls || !(cls = cls.trim())) {
     return
   }
 
   /* istanbul ignore else */
   if (el.classList) {
     if (cls.indexOf(' ') > -1) {
       cls.split(/\s+/).forEach(function (c) { return el.classList.remove(c); });
     } else {
       el.classList.remove(cls);
     }
     if (!el.classList.length) {
       el.removeAttribute('class');
     }
   } else {
     var cur = " " + (el.getAttribute('class') || '') + " ";
     var tar = ' ' + cls + ' ';
     while (cur.indexOf(tar) >= 0) {
       cur = cur.replace(tar, ' ');
     }
     cur = cur.trim();
     if (cur) {
       el.setAttribute('class', cur);
     } else {
       el.removeAttribute('class');
     }
   }
 }
 
 /*  */
 
 function resolveTransition (def$$1) {
   if (!def$$1) {
     return
   }
   /* istanbul ignore else */
   if (typeof def$$1 === 'object') {
     var res = {};
     if (def$$1.css !== false) {
       extend(res, autoCssTransition(def$$1.name || 'v'));
     }
     extend(res, def$$1);
     return res
   } else if (typeof def$$1 === 'string') {
     return autoCssTransition(def$$1)
   }
 }
 
 var autoCssTransition = cached(function (name) {
   return {
     enterClass: (name + "-enter"),
     enterToClass: (name + "-enter-to"),
     enterActiveClass: (name + "-enter-active"),
     leaveClass: (name + "-leave"),
     leaveToClass: (name + "-leave-to"),
     leaveActiveClass: (name + "-leave-active")
   }
 });
 
 var hasTransition = inBrowser && !isIE9;
 var TRANSITION = 'transition';
 var ANIMATION = 'animation';
 
 // Transition property/event sniffing
 var transitionProp = 'transition';
 var transitionEndEvent = 'transitionend';
 var animationProp = 'animation';
 var animationEndEvent = 'animationend';
 if (hasTransition) {
   /* istanbul ignore if */
   if (window.ontransitionend === undefined &&
     window.onwebkittransitionend !== undefined
   ) {
     transitionProp = 'WebkitTransition';
     transitionEndEvent = 'webkitTransitionEnd';
   }
   if (window.onanimationend === undefined &&
     window.onwebkitanimationend !== undefined
   ) {
     animationProp = 'WebkitAnimation';
     animationEndEvent = 'webkitAnimationEnd';
   }
 }
 
 // binding to window is necessary to make hot reload work in IE in strict mode
 var raf = inBrowser && window.requestAnimationFrame
   ? window.requestAnimationFrame.bind(window)
   : setTimeout;
 
 function nextFrame (fn) {
   raf(function () {
     raf(fn);
   });
 }
 
 function addTransitionClass (el, cls) {
   var transitionClasses = el._transitionClasses || (el._transitionClasses = []);
   if (transitionClasses.indexOf(cls) < 0) {
     transitionClasses.push(cls);
     addClass(el, cls);
   }
 }
 
 function removeTransitionClass (el, cls) {
   if (el._transitionClasses) {
     remove(el._transitionClasses, cls);
   }
   removeClass(el, cls);
 }
 
 function whenTransitionEnds (
   el,
   expectedType,
   cb
 ) {
   var ref = getTransitionInfo(el, expectedType);
   var type = ref.type;
   var timeout = ref.timeout;
   var propCount = ref.propCount;
   if (!type) { return cb() }
   var event = type === TRANSITION ? transitionEndEvent : animationEndEvent;
   var ended = 0;
   var end = function () {
     el.removeEventListener(event, onEnd);
     cb();
   };
   var onEnd = function (e) {
     if (e.target === el) {
       if (++ended >= propCount) {
         end();
       }
     }
   };
   setTimeout(function () {
     if (ended < propCount) {
       end();
     }
   }, timeout + 1);
   el.addEventListener(event, onEnd);
 }
 
 var transformRE = /\b(transform|all)(,|$)/;
 
 function getTransitionInfo (el, expectedType) {
   var styles = window.getComputedStyle(el);
   var transitionDelays = styles[transitionProp + 'Delay'].split(', ');
   var transitionDurations = styles[transitionProp + 'Duration'].split(', ');
   var transitionTimeout = getTimeout(transitionDelays, transitionDurations);
   var animationDelays = styles[animationProp + 'Delay'].split(', ');
   var animationDurations = styles[animationProp + 'Duration'].split(', ');
   var animationTimeout = getTimeout(animationDelays, animationDurations);
 
   var type;
   var timeout = 0;
   var propCount = 0;
   /* istanbul ignore if */
   if (expectedType === TRANSITION) {
     if (transitionTimeout > 0) {
       type = TRANSITION;
       timeout = transitionTimeout;
       propCount = transitionDurations.length;
     }
   } else if (expectedType === ANIMATION) {
     if (animationTimeout > 0) {
       type = ANIMATION;
       timeout = animationTimeout;
       propCount = animationDurations.length;
     }
   } else {
     timeout = Math.max(transitionTimeout, animationTimeout);
     type = timeout > 0
       ? transitionTimeout > animationTimeout
         ? TRANSITION
         : ANIMATION
       : null;
     propCount = type
       ? type === TRANSITION
         ? transitionDurations.length
         : animationDurations.length
       : 0;
   }
   var hasTransform =
     type === TRANSITION &&
     transformRE.test(styles[transitionProp + 'Property']);
   return {
     type: type,
     timeout: timeout,
     propCount: propCount,
     hasTransform: hasTransform
   }
 }
 
 function getTimeout (delays, durations) {
   /* istanbul ignore next */
   while (delays.length < durations.length) {
     delays = delays.concat(delays);
   }
 
   return Math.max.apply(null, durations.map(function (d, i) {
     return toMs(d) + toMs(delays[i])
   }))
 }
 
 function toMs (s) {
   return Number(s.slice(0, -1)) * 1000
 }
 
 /*  */
 
 function enter (vnode, toggleDisplay) {
   var el = vnode.elm;
 
   // call leave callback now
   if (isDef(el._leaveCb)) {
     el._leaveCb.cancelled = true;
     el._leaveCb();
   }
 
   var data = resolveTransition(vnode.data.transition);
   if (isUndef(data)) {
     return
   }
 
   /* istanbul ignore if */
   if (isDef(el._enterCb) || el.nodeType !== 1) {
     return
   }
 
   var css = data.css;
   var type = data.type;
   var enterClass = data.enterClass;
   var enterToClass = data.enterToClass;
   var enterActiveClass = data.enterActiveClass;
   var appearClass = data.appearClass;
   var appearToClass = data.appearToClass;
   var appearActiveClass = data.appearActiveClass;
   var beforeEnter = data.beforeEnter;
   var enter = data.enter;
   var afterEnter = data.afterEnter;
   var enterCancelled = data.enterCancelled;
   var beforeAppear = data.beforeAppear;
   var appear = data.appear;
   var afterAppear = data.afterAppear;
   var appearCancelled = data.appearCancelled;
   var duration = data.duration;
 
   // activeInstance will always be the <transition> component managing this
   // transition. One edge case to check is when the <transition> is placed
   // as the root node of a child component. In that case we need to check
   // <transition>'s parent for appear check.
   var context = activeInstance;
   var transitionNode = activeInstance.$vnode;
   while (transitionNode && transitionNode.parent) {
     transitionNode = transitionNode.parent;
     context = transitionNode.context;
   }
 
   var isAppear = !context._isMounted || !vnode.isRootInsert;
 
   if (isAppear && !appear && appear !== '') {
     return
   }
 
   var startClass = isAppear && appearClass
     ? appearClass
     : enterClass;
   var activeClass = isAppear && appearActiveClass
     ? appearActiveClass
     : enterActiveClass;
   var toClass = isAppear && appearToClass
     ? appearToClass
     : enterToClass;
 
   var beforeEnterHook = isAppear
     ? (beforeAppear || beforeEnter)
     : beforeEnter;
   var enterHook = isAppear
     ? (typeof appear === 'function' ? appear : enter)
     : enter;
   var afterEnterHook = isAppear
     ? (afterAppear || afterEnter)
     : afterEnter;
   var enterCancelledHook = isAppear
     ? (appearCancelled || enterCancelled)
     : enterCancelled;
 
   var explicitEnterDuration = toNumber(
     isObject(duration)
       ? duration.enter
       : duration
   );
 
   if ("development" !== 'production' && explicitEnterDuration != null) {
     checkDuration(explicitEnterDuration, 'enter', vnode);
   }
 
   var expectsCSS = css !== false && !isIE9;
   var userWantsControl = getHookArgumentsLength(enterHook);
 
   var cb = el._enterCb = once(function () {
     if (expectsCSS) {
       removeTransitionClass(el, toClass);
       removeTransitionClass(el, activeClass);
     }
     if (cb.cancelled) {
       if (expectsCSS) {
         removeTransitionClass(el, startClass);
       }
       enterCancelledHook && enterCancelledHook(el);
     } else {
       afterEnterHook && afterEnterHook(el);
     }
     el._enterCb = null;
   });
 
   if (!vnode.data.show) {
     // remove pending leave element on enter by injecting an insert hook
     mergeVNodeHook(vnode.data.hook || (vnode.data.hook = {}), 'insert', function () {
       var parent = el.parentNode;
       var pendingNode = parent && parent._pending && parent._pending[vnode.key];
       if (pendingNode &&
         pendingNode.tag === vnode.tag &&
         pendingNode.elm._leaveCb
       ) {
         pendingNode.elm._leaveCb();
       }
       enterHook && enterHook(el, cb);
     });
   }
 
   // start enter transition
   beforeEnterHook && beforeEnterHook(el);
   if (expectsCSS) {
     addTransitionClass(el, startClass);
     addTransitionClass(el, activeClass);
     nextFrame(function () {
       addTransitionClass(el, toClass);
       removeTransitionClass(el, startClass);
       if (!cb.cancelled && !userWantsControl) {
         if (isValidDuration(explicitEnterDuration)) {
           setTimeout(cb, explicitEnterDuration);
         } else {
           whenTransitionEnds(el, type, cb);
         }
       }
     });
   }
 
   if (vnode.data.show) {
     toggleDisplay && toggleDisplay();
     enterHook && enterHook(el, cb);
   }
 
   if (!expectsCSS && !userWantsControl) {
     cb();
   }
 }
 
 function leave (vnode, rm) {
   var el = vnode.elm;
 
   // call enter callback now
   if (isDef(el._enterCb)) {
     el._enterCb.cancelled = true;
     el._enterCb();
   }
 
   var data = resolveTransition(vnode.data.transition);
   if (isUndef(data)) {
     return rm()
   }
 
   /* istanbul ignore if */
   if (isDef(el._leaveCb) || el.nodeType !== 1) {
     return
   }
 
   var css = data.css;
   var type = data.type;
   var leaveClass = data.leaveClass;
   var leaveToClass = data.leaveToClass;
   var leaveActiveClass = data.leaveActiveClass;
   var beforeLeave = data.beforeLeave;
   var leave = data.leave;
   var afterLeave = data.afterLeave;
   var leaveCancelled = data.leaveCancelled;
   var delayLeave = data.delayLeave;
   var duration = data.duration;
 
   var expectsCSS = css !== false && !isIE9;
   var userWantsControl = getHookArgumentsLength(leave);
 
   var explicitLeaveDuration = toNumber(
     isObject(duration)
       ? duration.leave
       : duration
   );
 
   if ("development" !== 'production' && isDef(explicitLeaveDuration)) {
     checkDuration(explicitLeaveDuration, 'leave', vnode);
   }
 
   var cb = el._leaveCb = once(function () {
     if (el.parentNode && el.parentNode._pending) {
       el.parentNode._pending[vnode.key] = null;
     }
     if (expectsCSS) {
       removeTransitionClass(el, leaveToClass);
       removeTransitionClass(el, leaveActiveClass);
     }
     if (cb.cancelled) {
       if (expectsCSS) {
         removeTransitionClass(el, leaveClass);
       }
       leaveCancelled && leaveCancelled(el);
     } else {
       rm();
       afterLeave && afterLeave(el);
     }
     el._leaveCb = null;
   });
 
   if (delayLeave) {
     delayLeave(performLeave);
   } else {
     performLeave();
   }
 
   function performLeave () {
     // the delayed leave may have already been cancelled
     if (cb.cancelled) {
       return
     }
     // record leaving element
     if (!vnode.data.show) {
       (el.parentNode._pending || (el.parentNode._pending = {}))[(vnode.key)] = vnode;
     }
     beforeLeave && beforeLeave(el);
     if (expectsCSS) {
       addTransitionClass(el, leaveClass);
       addTransitionClass(el, leaveActiveClass);
       nextFrame(function () {
         addTransitionClass(el, leaveToClass);
         removeTransitionClass(el, leaveClass);
         if (!cb.cancelled && !userWantsControl) {
           if (isValidDuration(explicitLeaveDuration)) {
             setTimeout(cb, explicitLeaveDuration);
           } else {
             whenTransitionEnds(el, type, cb);
           }
         }
       });
     }
     leave && leave(el, cb);
     if (!expectsCSS && !userWantsControl) {
       cb();
     }
   }
 }
 
 // only used in dev mode
 function checkDuration (val, name, vnode) {
   if (typeof val !== 'number') {
     warn(
       "<transition> explicit " + name + " duration is not a valid number - " +
       "got " + (JSON.stringify(val)) + ".",
       vnode.context
     );
   } else if (isNaN(val)) {
     warn(
       "<transition> explicit " + name + " duration is NaN - " +
       'the duration expression might be incorrect.',
       vnode.context
     );
   }
 }
 
 function isValidDuration (val) {
   return typeof val === 'number' && !isNaN(val)
 }
 
 /**
  * Normalize a transition hook's argument length. The hook may be:
  * - a merged hook (invoker) with the original in .fns
  * - a wrapped component method (check ._length)
  * - a plain function (.length)
  */
 function getHookArgumentsLength (fn) {
   if (isUndef(fn)) {
     return false
   }
   var invokerFns = fn.fns;
   if (isDef(invokerFns)) {
     // invoker
     return getHookArgumentsLength(
       Array.isArray(invokerFns)
         ? invokerFns[0]
         : invokerFns
     )
   } else {
     return (fn._length || fn.length) > 1
   }
 }
 
 function _enter (_, vnode) {
   if (vnode.data.show !== true) {
     enter(vnode);
   }
 }
 
 var transition = inBrowser ? {
   create: _enter,
   activate: _enter,
   remove: function remove$$1 (vnode, rm) {
     /* istanbul ignore else */
     if (vnode.data.show !== true) {
       leave(vnode, rm);
     } else {
       rm();
     }
   }
 } : {};
 
 var platformModules = [
   attrs,
   klass,
   events,
   domProps,
   style,
   transition
 ];
 
 /*  */
 
 // the directive module should be applied last, after all
 // built-in modules have been applied.
 var modules = platformModules.concat(baseModules);
 
 var patch = createPatchFunction({ nodeOps: nodeOps, modules: modules });
 
 /**
  * Not type checking this file because flow doesn't like attaching
  * properties to Elements.
  */
 
 var isTextInputType = makeMap('text,number,password,search,email,tel,url');
 
 /* istanbul ignore if */
 if (isIE9) {
   // http://www.matts411.com/post/internet-explorer-9-oninput/
   document.addEventListener('selectionchange', function () {
     var el = document.activeElement;
     if (el && el.vmodel) {
       trigger(el, 'input');
     }
   });
 }
 
 var model$1 = {
   inserted: function inserted (el, binding, vnode) {
     if (vnode.tag === 'select') {
       var cb = function () {
         setSelected(el, binding, vnode.context);
       };
       cb();
       /* istanbul ignore if */
       if (isIE || isEdge) {
         setTimeout(cb, 0);
       }
     } else if (vnode.tag === 'textarea' || isTextInputType(el.type)) {
       el._vModifiers = binding.modifiers;
       if (!binding.modifiers.lazy) {
         // Safari < 10.2 & UIWebView doesn't fire compositionend when
         // switching focus before confirming composition choice
         // this also fixes the issue where some browsers e.g. iOS Chrome
         // fires "change" instead of "input" on autocomplete.
         el.addEventListener('change', onCompositionEnd);
         if (!isAndroid) {
           el.addEventListener('compositionstart', onCompositionStart);
           el.addEventListener('compositionend', onCompositionEnd);
         }
         /* istanbul ignore if */
         if (isIE9) {
           el.vmodel = true;
         }
       }
     }
   },
   componentUpdated: function componentUpdated (el, binding, vnode) {
     if (vnode.tag === 'select') {
       setSelected(el, binding, vnode.context);
       // in case the options rendered by v-for have changed,
       // it's possible that the value is out-of-sync with the rendered options.
       // detect such cases and filter out values that no longer has a matching
       // option in the DOM.
       var needReset = el.multiple
         ? binding.value.some(function (v) { return hasNoMatchingOption(v, el.options); })
         : binding.value !== binding.oldValue && hasNoMatchingOption(binding.value, el.options);
       if (needReset) {
         trigger(el, 'change');
       }
     }
   }
 };
 
 function setSelected (el, binding, vm) {
   var value = binding.value;
   var isMultiple = el.multiple;
   if (isMultiple && !Array.isArray(value)) {
     "development" !== 'production' && warn(
       "<select multiple v-model=\"" + (binding.expression) + "\"> " +
       "expects an Array value for its binding, but got " + (Object.prototype.toString.call(value).slice(8, -1)),
       vm
     );
     return
   }
   var selected, option;
   for (var i = 0, l = el.options.length; i < l; i++) {
     option = el.options[i];
     if (isMultiple) {
       selected = looseIndexOf(value, getValue(option)) > -1;
       if (option.selected !== selected) {
         option.selected = selected;
       }
     } else {
       if (looseEqual(getValue(option), value)) {
         if (el.selectedIndex !== i) {
           el.selectedIndex = i;
         }
         return
       }
     }
   }
   if (!isMultiple) {
     el.selectedIndex = -1;
   }
 }
 
 function hasNoMatchingOption (value, options) {
   for (var i = 0, l = options.length; i < l; i++) {
     if (looseEqual(getValue(options[i]), value)) {
       return false
     }
   }
   return true
 }
 
 function getValue (option) {
   return '_value' in option
     ? option._value
     : option.value
 }
 
 function onCompositionStart (e) {
   e.target.composing = true;
 }
 
 function onCompositionEnd (e) {
   // prevent triggering an input event for no reason
   if (!e.target.composing) { return }
   e.target.composing = false;
   trigger(e.target, 'input');
 }
 
 function trigger (el, type) {
   var e = document.createEvent('HTMLEvents');
   e.initEvent(type, true, true);
   el.dispatchEvent(e);
 }
 
 /*  */
 
 // recursively search for possible transition defined inside the component root
 function locateNode (vnode) {
   return vnode.componentInstance && (!vnode.data || !vnode.data.transition)
     ? locateNode(vnode.componentInstance._vnode)
     : vnode
 }
 
 var show = {
   bind: function bind (el, ref, vnode) {
     var value = ref.value;
 
     vnode = locateNode(vnode);
     var transition$$1 = vnode.data && vnode.data.transition;
     var originalDisplay = el.__vOriginalDisplay =
       el.style.display === 'none' ? '' : el.style.display;
     if (value && transition$$1 && !isIE9) {
       vnode.data.show = true;
       enter(vnode, function () {
         el.style.display = originalDisplay;
       });
     } else {
       el.style.display = value ? originalDisplay : 'none';
     }
   },
 
   update: function update (el, ref, vnode) {
     var value = ref.value;
     var oldValue = ref.oldValue;
 
     /* istanbul ignore if */
     if (value === oldValue) { return }
     vnode = locateNode(vnode);
     var transition$$1 = vnode.data && vnode.data.transition;
     if (transition$$1 && !isIE9) {
       vnode.data.show = true;
       if (value) {
         enter(vnode, function () {
           el.style.display = el.__vOriginalDisplay;
         });
       } else {
         leave(vnode, function () {
           el.style.display = 'none';
         });
       }
     } else {
       el.style.display = value ? el.__vOriginalDisplay : 'none';
     }
   },
 
   unbind: function unbind (
     el,
     binding,
     vnode,
     oldVnode,
     isDestroy
   ) {
     if (!isDestroy) {
       el.style.display = el.__vOriginalDisplay;
     }
   }
 };
 
 var platformDirectives = {
   model: model$1,
   show: show
 };
 
 /*  */
 
 // Provides transition support for a single element/component.
 // supports transition mode (out-in / in-out)
 
 var transitionProps = {
   name: String,
   appear: Boolean,
   css: Boolean,
   mode: String,
   type: String,
   enterClass: String,
   leaveClass: String,
   enterToClass: String,
   leaveToClass: String,
   enterActiveClass: String,
   leaveActiveClass: String,
   appearClass: String,
   appearActiveClass: String,
   appearToClass: String,
   duration: [Number, String, Object]
 };
 
 // in case the child is also an abstract component, e.g. <keep-alive>
 // we want to recursively retrieve the real component to be rendered
 function getRealChild (vnode) {
   var compOptions = vnode && vnode.componentOptions;
   if (compOptions && compOptions.Ctor.options.abstract) {
     return getRealChild(getFirstComponentChild(compOptions.children))
   } else {
     return vnode
   }
 }
 
 function extractTransitionData (comp) {
   var data = {};
   var options = comp.$options;
   // props
   for (var key in options.propsData) {
     data[key] = comp[key];
   }
   // events.
   // extract listeners and pass them directly to the transition methods
   var listeners = options._parentListeners;
   for (var key$1 in listeners) {
     data[camelize(key$1)] = listeners[key$1];
   }
   return data
 }
 
 function placeholder (h, rawChild) {
   if (/\d-keep-alive$/.test(rawChild.tag)) {
     return h('keep-alive', {
       props: rawChild.componentOptions.propsData
     })
   }
 }
 
 function hasParentTransition (vnode) {
   while ((vnode = vnode.parent)) {
     if (vnode.data.transition) {
       return true
     }
   }
 }
 
 function isSameChild (child, oldChild) {
   return oldChild.key === child.key && oldChild.tag === child.tag
 }
 
 function isAsyncPlaceholder (node) {
   return node.isComment && node.asyncFactory
 }
 
 var Transition = {
   name: 'transition',
   props: transitionProps,
   abstract: true,
 
   render: function render (h) {
     var this$1 = this;
 
     var children = this.$options._renderChildren;
     if (!children) {
       return
     }
 
     // filter out text nodes (possible whitespaces)
     children = children.filter(function (c) { return c.tag || isAsyncPlaceholder(c); });
     /* istanbul ignore if */
     if (!children.length) {
       return
     }
 
     // warn multiple elements
     if ("development" !== 'production' && children.length > 1) {
       warn(
         '<transition> can only be used on a single element. Use ' +
         '<transition-group> for lists.',
         this.$parent
       );
     }
 
     var mode = this.mode;
 
     // warn invalid mode
     if ("development" !== 'production' &&
       mode && mode !== 'in-out' && mode !== 'out-in'
     ) {
       warn(
         'invalid <transition> mode: ' + mode,
         this.$parent
       );
     }
 
     var rawChild = children[0];
 
     // if this is a component root node and the component's
     // parent container node also has transition, skip.
     if (hasParentTransition(this.$vnode)) {
       return rawChild
     }
 
     // apply transition data to child
     // use getRealChild() to ignore abstract components e.g. keep-alive
     var child = getRealChild(rawChild);
     /* istanbul ignore if */
     if (!child) {
       return rawChild
     }
 
     if (this._leaving) {
       return placeholder(h, rawChild)
     }
 
     // ensure a key that is unique to the vnode type and to this transition
     // component instance. This key will be used to remove pending leaving nodes
     // during entering.
     var id = "__transition-" + (this._uid) + "-";
     child.key = child.key == null
       ? child.isComment
         ? id + 'comment'
         : id + child.tag
       : isPrimitive(child.key)
         ? (String(child.key).indexOf(id) === 0 ? child.key : id + child.key)
         : child.key;
 
     var data = (child.data || (child.data = {})).transition = extractTransitionData(this);
     var oldRawChild = this._vnode;
     var oldChild = getRealChild(oldRawChild);
 
     // mark v-show
     // so that the transition module can hand over the control to the directive
     if (child.data.directives && child.data.directives.some(function (d) { return d.name === 'show'; })) {
       child.data.show = true;
     }
 
     if (
       oldChild &&
       oldChild.data &&
       !isSameChild(child, oldChild) &&
       !isAsyncPlaceholder(oldChild)
     ) {
       // replace old child transition data with fresh one
       // important for dynamic transitions!
       var oldData = oldChild && (oldChild.data.transition = extend({}, data));
       // handle transition mode
       if (mode === 'out-in') {
         // return placeholder node and queue update when leave finishes
         this._leaving = true;
         mergeVNodeHook(oldData, 'afterLeave', function () {
           this$1._leaving = false;
           this$1.$forceUpdate();
         });
         return placeholder(h, rawChild)
       } else if (mode === 'in-out') {
         if (isAsyncPlaceholder(child)) {
           return oldRawChild
         }
         var delayedLeave;
         var performLeave = function () { delayedLeave(); };
         mergeVNodeHook(data, 'afterEnter', performLeave);
         mergeVNodeHook(data, 'enterCancelled', performLeave);
         mergeVNodeHook(oldData, 'delayLeave', function (leave) { delayedLeave = leave; });
       }
     }
 
     return rawChild
   }
 };
 
 /*  */
 
 // Provides transition support for list items.
 // supports move transitions using the FLIP technique.
 
 // Because the vdom's children update algorithm is "unstable" - i.e.
 // it doesn't guarantee the relative positioning of removed elements,
 // we force transition-group to update its children into two passes:
 // in the first pass, we remove all nodes that need to be removed,
 // triggering their leaving transition; in the second pass, we insert/move
 // into the final desired state. This way in the second pass removed
 // nodes will remain where they should be.
 
 var props = extend({
   tag: String,
   moveClass: String
 }, transitionProps);
 
 delete props.mode;
 
 var TransitionGroup = {
   props: props,
 
   render: function render (h) {
     var tag = this.tag || this.$vnode.data.tag || 'span';
     var map = Object.create(null);
     var prevChildren = this.prevChildren = this.children;
     var rawChildren = this.$slots.default || [];
     var children = this.children = [];
     var transitionData = extractTransitionData(this);
 
     for (var i = 0; i < rawChildren.length; i++) {
       var c = rawChildren[i];
       if (c.tag) {
         if (c.key != null && String(c.key).indexOf('__vlist') !== 0) {
           children.push(c);
           map[c.key] = c
           ;(c.data || (c.data = {})).transition = transitionData;
         } else {
           var opts = c.componentOptions;
           var name = opts ? (opts.Ctor.options.name || opts.tag || '') : c.tag;
           warn(("<transition-group> children must be keyed: <" + name + ">"));
         }
       }
     }
 
     if (prevChildren) {
       var kept = [];
       var removed = [];
       for (var i$1 = 0; i$1 < prevChildren.length; i$1++) {
         var c$1 = prevChildren[i$1];
         c$1.data.transition = transitionData;
         c$1.data.pos = c$1.elm.getBoundingClientRect();
         if (map[c$1.key]) {
           kept.push(c$1);
         } else {
           removed.push(c$1);
         }
       }
       this.kept = h(tag, null, kept);
       this.removed = removed;
     }
 
     return h(tag, null, children)
   },
 
   beforeUpdate: function beforeUpdate () {
     // force removing pass
     this.__patch__(
       this._vnode,
       this.kept,
       false, // hydrating
       true // removeOnly (!important, avoids unnecessary moves)
     );
     this._vnode = this.kept;
   },
 
   updated: function updated () {
     var children = this.prevChildren;
     var moveClass = this.moveClass || ((this.name || 'v') + '-move');
     if (!children.length || !this.hasMove(children[0].elm, moveClass)) {
       return
     }
 
     // we divide the work into three loops to avoid mixing DOM reads and writes
     // in each iteration - which helps prevent layout thrashing.
     children.forEach(callPendingCbs);
     children.forEach(recordPosition);
     children.forEach(applyTranslation);
 
     // force reflow to put everything in position
     var body = document.body;
     var f = body.offsetHeight; // eslint-disable-line
 
     children.forEach(function (c) {
       if (c.data.moved) {
         var el = c.elm;
         var s = el.style;
         addTransitionClass(el, moveClass);
         s.transform = s.WebkitTransform = s.transitionDuration = '';
         el.addEventListener(transitionEndEvent, el._moveCb = function cb (e) {
           if (!e || /transform$/.test(e.propertyName)) {
             el.removeEventListener(transitionEndEvent, cb);
             el._moveCb = null;
             removeTransitionClass(el, moveClass);
           }
         });
       }
     });
   },
 
   methods: {
     hasMove: function hasMove (el, moveClass) {
       /* istanbul ignore if */
       if (!hasTransition) {
         return false
       }
       /* istanbul ignore if */
       if (this._hasMove) {
         return this._hasMove
       }
       // Detect whether an element with the move class applied has
       // CSS transitions. Since the element may be inside an entering
       // transition at this very moment, we make a clone of it and remove
       // all other transition classes applied to ensure only the move class
       // is applied.
       var clone = el.cloneNode();
       if (el._transitionClasses) {
         el._transitionClasses.forEach(function (cls) { removeClass(clone, cls); });
       }
       addClass(clone, moveClass);
       clone.style.display = 'none';
       this.$el.appendChild(clone);
       var info = getTransitionInfo(clone);
       this.$el.removeChild(clone);
       return (this._hasMove = info.hasTransform)
     }
   }
 };
 
 function callPendingCbs (c) {
   /* istanbul ignore if */
   if (c.elm._moveCb) {
     c.elm._moveCb();
   }
   /* istanbul ignore if */
   if (c.elm._enterCb) {
     c.elm._enterCb();
   }
 }
 
 function recordPosition (c) {
   c.data.newPos = c.elm.getBoundingClientRect();
 }
 
 function applyTranslation (c) {
   var oldPos = c.data.pos;
   var newPos = c.data.newPos;
   var dx = oldPos.left - newPos.left;
   var dy = oldPos.top - newPos.top;
   if (dx || dy) {
     c.data.moved = true;
     var s = c.elm.style;
     s.transform = s.WebkitTransform = "translate(" + dx + "px," + dy + "px)";
     s.transitionDuration = '0s';
   }
 }
 
 var platformComponents = {
   Transition: Transition,
   TransitionGroup: TransitionGroup
 };
 
 /*  */
 
 // install platform specific utils
 Vue$3.config.mustUseProp = mustUseProp;
 Vue$3.config.isReservedTag = isReservedTag;
 Vue$3.config.isReservedAttr = isReservedAttr;
 Vue$3.config.getTagNamespace = getTagNamespace;
 Vue$3.config.isUnknownElement = isUnknownElement;
 
 // install platform runtime directives & components
 extend(Vue$3.options.directives, platformDirectives);
 extend(Vue$3.options.components, platformComponents);
 
 // install platform patch function
 Vue$3.prototype.__patch__ = inBrowser ? patch : noop;
 
 // public mount method
 Vue$3.prototype.$mount = function (
   el,
   hydrating
 ) {
   el = el && inBrowser ? query(el) : undefined;
   return mountComponent(this, el, hydrating)
 };
 
 // devtools global hook
 /* istanbul ignore next */
 setTimeout(function () {
   if (config.devtools) {
     if (devtools) {
       devtools.emit('init', Vue$3);
     } else if ("development" !== 'production' && isChrome) {
       console[console.info ? 'info' : 'log'](
         'Download the Vue Devtools extension for a better development experience:\n' +
         'https://github.com/vuejs/vue-devtools'
       );
     }
   }
   if ("development" !== 'production' &&
     config.productionTip !== false &&
     inBrowser && typeof console !== 'undefined'
   ) {
     console[console.info ? 'info' : 'log'](
       "You are running Vue in development mode.\n" +
       "Make sure to turn on production mode when deploying for production.\n" +
       "See more tips at https://vuejs.org/guide/deployment.html"
     );
   }
 }, 0);
 
 /*  */
 
 // check whether current browser encodes a char inside attribute values
 function shouldDecode (content, encoded) {
   var div = document.createElement('div');
   div.innerHTML = "<div a=\"" + content + "\"/>";
   return div.innerHTML.indexOf(encoded) > 0
 }
 
 // #3663
 // IE encodes newlines inside attribute values while other browsers don't
 var shouldDecodeNewlines = inBrowser ? shouldDecode('\n', '&#10;') : false;
 
 /*  */
 
 var defaultTagRE = /\{\{((?:.|\n)+?)\}\}/g;
 var regexEscapeRE = /[-.*+?^${}()|[\]\/\\]/g;
 
 var buildRegex = cached(function (delimiters) {
   var open = delimiters[0].replace(regexEscapeRE, '\\$&');
   var close = delimiters[1].replace(regexEscapeRE, '\\$&');
   return new RegExp(open + '((?:.|\\n)+?)' + close, 'g')
 });
 
 function parseText (
   text,
   delimiters
 ) {
   var tagRE = delimiters ? buildRegex(delimiters) : defaultTagRE;
   if (!tagRE.test(text)) {
     return
   }
   var tokens = [];
   var lastIndex = tagRE.lastIndex = 0;
   var match, index;
   while ((match = tagRE.exec(text))) {
     index = match.index;
     // push text token
     if (index > lastIndex) {
       tokens.push(JSON.stringify(text.slice(lastIndex, index)));
     }
     // tag token
     var exp = parseFilters(match[1].trim());
     tokens.push(("_s(" + exp + ")"));
     lastIndex = index + match[0].length;
   }
   if (lastIndex < text.length) {
     tokens.push(JSON.stringify(text.slice(lastIndex)));
   }
   return tokens.join('+')
 }
 
 /*  */
 
 function transformNode (el, options) {
   var warn = options.warn || baseWarn;
   var staticClass = getAndRemoveAttr(el, 'class');
   if ("development" !== 'production' && staticClass) {
     var expression = parseText(staticClass, options.delimiters);
     if (expression) {
       warn(
         "class=\"" + staticClass + "\": " +
         'Interpolation inside attributes has been removed. ' +
         'Use v-bind or the colon shorthand instead. For example, ' +
         'instead of <div class="{{ val }}">, use <div :class="val">.'
       );
     }
   }
   if (staticClass) {
     el.staticClass = JSON.stringify(staticClass);
   }
   var classBinding = getBindingAttr(el, 'class', false /* getStatic */);
   if (classBinding) {
     el.classBinding = classBinding;
   }
 }
 
 function genData (el) {
   var data = '';
   if (el.staticClass) {
     data += "staticClass:" + (el.staticClass) + ",";
   }
   if (el.classBinding) {
     data += "class:" + (el.classBinding) + ",";
   }
   return data
 }
 
 var klass$1 = {
   staticKeys: ['staticClass'],
   transformNode: transformNode,
   genData: genData
 };
 
 /*  */
 
 function transformNode$1 (el, options) {
   var warn = options.warn || baseWarn;
   var staticStyle = getAndRemoveAttr(el, 'style');
   if (staticStyle) {
     /* istanbul ignore if */
     {
       var expression = parseText(staticStyle, options.delimiters);
       if (expression) {
         warn(
           "style=\"" + staticStyle + "\": " +
           'Interpolation inside attributes has been removed. ' +
           'Use v-bind or the colon shorthand instead. For example, ' +
           'instead of <div style="{{ val }}">, use <div :style="val">.'
         );
       }
     }
     el.staticStyle = JSON.stringify(parseStyleText(staticStyle));
   }
 
   var styleBinding = getBindingAttr(el, 'style', false /* getStatic */);
   if (styleBinding) {
     el.styleBinding = styleBinding;
   }
 }
 
 function genData$1 (el) {
   var data = '';
   if (el.staticStyle) {
     data += "staticStyle:" + (el.staticStyle) + ",";
   }
   if (el.styleBinding) {
     data += "style:(" + (el.styleBinding) + "),";
   }
   return data
 }
 
 var style$1 = {
   staticKeys: ['staticStyle'],
   transformNode: transformNode$1,
   genData: genData$1
 };
 
 var modules$1 = [
   klass$1,
   style$1
 ];
 
 /*  */
 
 function text (el, dir) {
   if (dir.value) {
     addProp(el, 'textContent', ("_s(" + (dir.value) + ")"));
   }
 }
 
 /*  */
 
 function html (el, dir) {
   if (dir.value) {
     addProp(el, 'innerHTML', ("_s(" + (dir.value) + ")"));
   }
 }
 
 var directives$1 = {
   model: model,
   text: text,
   html: html
 };
 
 /*  */
 
 var isUnaryTag = makeMap(
   'area,base,br,col,embed,frame,hr,img,input,isindex,keygen,' +
   'link,meta,param,source,track,wbr'
 );
 
 // Elements that you can, intentionally, leave open
 // (and which close themselves)
 var canBeLeftOpenTag = makeMap(
   'colgroup,dd,dt,li,options,p,td,tfoot,th,thead,tr,source'
 );
 
 // HTML5 tags https://html.spec.whatwg.org/multipage/indices.html#elements-3
 // Phrasing Content https://html.spec.whatwg.org/multipage/dom.html#phrasing-content
 var isNonPhrasingTag = makeMap(
   'address,article,aside,base,blockquote,body,caption,col,colgroup,dd,' +
   'details,dialog,div,dl,dt,fieldset,figcaption,figure,footer,form,' +
   'h1,h2,h3,h4,h5,h6,head,header,hgroup,hr,html,legend,li,menuitem,meta,' +
   'optgroup,option,param,rp,rt,source,style,summary,tbody,td,tfoot,th,thead,' +
   'title,tr,track'
 );
 
 /*  */
 
 var baseOptions = {
   expectHTML: true,
   modules: modules$1,
   directives: directives$1,
   isPreTag: isPreTag,
   isUnaryTag: isUnaryTag,
   mustUseProp: mustUseProp,
   canBeLeftOpenTag: canBeLeftOpenTag,
   isReservedTag: isReservedTag,
   getTagNamespace: getTagNamespace,
   staticKeys: genStaticKeys(modules$1)
 };
 
 /*  */
 
 var decoder;
 
 var he = {
   decode: function decode (html) {
     decoder = decoder || document.createElement('div');
     decoder.innerHTML = html;
     return decoder.textContent
   }
 };
 
 /**
  * Not type-checking this file because it's mostly vendor code.
  */
 
 /*!
  * HTML Parser By John Resig (ejohn.org)
  * Modified by Juriy "kangax" Zaytsev
  * Original code by Erik Arvidsson, Mozilla Public License
  * http://erik.eae.net/simplehtmlparser/simplehtmlparser.js
  */
 
 // Regular Expressions for parsing tags and attributes
 var singleAttrIdentifier = /([^\s"'<>/=]+)/;
 var singleAttrAssign = /(?:=)/;
 var singleAttrValues = [
   // attr value double quotes
   /"([^"]*)"+/.source,
   // attr value, single quotes
   /'([^']*)'+/.source,
   // attr value, no quotes
   /([^\s"'=<>`]+)/.source
 ];
 var attribute = new RegExp(
   '^\\s*' + singleAttrIdentifier.source +
   '(?:\\s*(' + singleAttrAssign.source + ')' +
   '\\s*(?:' + singleAttrValues.join('|') + '))?'
 );
 
 // could use https://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-QName
 // but for Vue templates we can enforce a simple charset
 var ncname = '[a-zA-Z_][\\w\\-\\.]*';
 var qnameCapture = '((?:' + ncname + '\\:)?' + ncname + ')';
 var startTagOpen = new RegExp('^<' + qnameCapture);
 var startTagClose = /^\s*(\/?)>/;
 var endTag = new RegExp('^<\\/' + qnameCapture + '[^>]*>');
 var doctype = /^<!DOCTYPE [^>]+>/i;
 var comment = /^<!--/;
 var conditionalComment = /^<!\[/;
 
 var IS_REGEX_CAPTURING_BROKEN = false;
 'x'.replace(/x(.)?/g, function (m, g) {
   IS_REGEX_CAPTURING_BROKEN = g === '';
 });
 
 // Special Elements (can contain anything)
 var isPlainTextElement = makeMap('script,style,textarea', true);
 var reCache = {};
 
 var decodingMap = {
   '&lt;': '<',
   '&gt;': '>',
   '&quot;': '"',
   '&amp;': '&',
   '&#10;': '\n'
 };
 var encodedAttr = /&(?:lt|gt|quot|amp);/g;
 var encodedAttrWithNewLines = /&(?:lt|gt|quot|amp|#10);/g;
 
 // #5992
 var isIgnoreNewlineTag = makeMap('pre,textarea', true);
 var shouldIgnoreFirstNewline = function (tag, html) { return tag && isIgnoreNewlineTag(tag) && html[0] === '\n'; };
 
 function decodeAttr (value, shouldDecodeNewlines) {
   var re = shouldDecodeNewlines ? encodedAttrWithNewLines : encodedAttr;
   return value.replace(re, function (match) { return decodingMap[match]; })
 }
 
 function parseHTML (html, options) {
   var stack = [];
   var expectHTML = options.expectHTML;
   var isUnaryTag$$1 = options.isUnaryTag || no;
   var canBeLeftOpenTag$$1 = options.canBeLeftOpenTag || no;
   var index = 0;
   var last, lastTag;
   while (html) {
     last = html;
     // Make sure we're not in a plaintext content element like script/style
     if (!lastTag || !isPlainTextElement(lastTag)) {
       if (shouldIgnoreFirstNewline(lastTag, html)) {
         advance(1);
       }
       var textEnd = html.indexOf('<');
       if (textEnd === 0) {
         // Comment:
         if (comment.test(html)) {
           var commentEnd = html.indexOf('-->');
 
           if (commentEnd >= 0) {
             if (options.shouldKeepComment) {
               options.comment(html.substring(4, commentEnd));
             }
             advance(commentEnd + 3);
             continue
           }
         }
 
         // http://en.wikipedia.org/wiki/Conditional_comment#Downlevel-revealed_conditional_comment
         if (conditionalComment.test(html)) {
           var conditionalEnd = html.indexOf(']>');
 
           if (conditionalEnd >= 0) {
             advance(conditionalEnd + 2);
             continue
           }
         }
 
         // Doctype:
         var doctypeMatch = html.match(doctype);
         if (doctypeMatch) {
           advance(doctypeMatch[0].length);
           continue
         }
 
         // End tag:
         var endTagMatch = html.match(endTag);
         if (endTagMatch) {
           var curIndex = index;
           advance(endTagMatch[0].length);
           parseEndTag(endTagMatch[1], curIndex, index);
           continue
         }
 
         // Start tag:
         var startTagMatch = parseStartTag();
         if (startTagMatch) {
           handleStartTag(startTagMatch);
           continue
         }
       }
 
       var text = (void 0), rest = (void 0), next = (void 0);
       if (textEnd >= 0) {
         rest = html.slice(textEnd);
         while (
           !endTag.test(rest) &&
           !startTagOpen.test(rest) &&
           !comment.test(rest) &&
           !conditionalComment.test(rest)
         ) {
           // < in plain text, be forgiving and treat it as text
           next = rest.indexOf('<', 1);
           if (next < 0) { break }
           textEnd += next;
           rest = html.slice(textEnd);
         }
         text = html.substring(0, textEnd);
         advance(textEnd);
       }
 
       if (textEnd < 0) {
         text = html;
         html = '';
       }
 
       if (options.chars && text) {
         options.chars(text);
       }
     } else {
       var endTagLength = 0;
       var stackedTag = lastTag.toLowerCase();
       var reStackedTag = reCache[stackedTag] || (reCache[stackedTag] = new RegExp('([\\s\\S]*?)(</' + stackedTag + '[^>]*>)', 'i'));
       var rest$1 = html.replace(reStackedTag, function (all, text, endTag) {
         endTagLength = endTag.length;
         if (!isPlainTextElement(stackedTag) && stackedTag !== 'noscript') {
           text = text
             .replace(/<!--([\s\S]*?)-->/g, '$1')
             .replace(/<!\[CDATA\[([\s\S]*?)]]>/g, '$1');
         }
         if (shouldIgnoreFirstNewline(stackedTag, text)) {
           text = text.slice(1);
         }
         if (options.chars) {
           options.chars(text);
         }
         return ''
       });
       index += html.length - rest$1.length;
       html = rest$1;
       parseEndTag(stackedTag, index - endTagLength, index);
     }
 
     if (html === last) {
       options.chars && options.chars(html);
       if ("development" !== 'production' && !stack.length && options.warn) {
         options.warn(("Mal-formatted tag at end of template: \"" + html + "\""));
       }
       break
     }
   }
 
   // Clean up any remaining tags
   parseEndTag();
 
   function advance (n) {
     index += n;
     html = html.substring(n);
   }
 
   function parseStartTag () {
     var start = html.match(startTagOpen);
     if (start) {
       var match = {
         tagName: start[1],
         attrs: [],
         start: index
       };
       advance(start[0].length);
       var end, attr;
       while (!(end = html.match(startTagClose)) && (attr = html.match(attribute))) {
         advance(attr[0].length);
         match.attrs.push(attr);
       }
       if (end) {
         match.unarySlash = end[1];
         advance(end[0].length);
         match.end = index;
         return match
       }
     }
   }
 
   function handleStartTag (match) {
     var tagName = match.tagName;
     var unarySlash = match.unarySlash;
 
     if (expectHTML) {
       if (lastTag === 'p' && isNonPhrasingTag(tagName)) {
         parseEndTag(lastTag);
       }
       if (canBeLeftOpenTag$$1(tagName) && lastTag === tagName) {
         parseEndTag(tagName);
       }
     }
 
     var unary = isUnaryTag$$1(tagName) || !!unarySlash;
 
     var l = match.attrs.length;
     var attrs = new Array(l);
     for (var i = 0; i < l; i++) {
       var args = match.attrs[i];
       // hackish work around FF bug https://bugzilla.mozilla.org/show_bug.cgi?id=369778
       if (IS_REGEX_CAPTURING_BROKEN && args[0].indexOf('""') === -1) {
         if (args[3] === '') { delete args[3]; }
         if (args[4] === '') { delete args[4]; }
         if (args[5] === '') { delete args[5]; }
       }
       var value = args[3] || args[4] || args[5] || '';
       attrs[i] = {
         name: args[1],
         value: decodeAttr(
           value,
           options.shouldDecodeNewlines
         )
       };
     }
 
     if (!unary) {
       stack.push({ tag: tagName, lowerCasedTag: tagName.toLowerCase(), attrs: attrs });
       lastTag = tagName;
     }
 
     if (options.start) {
       options.start(tagName, attrs, unary, match.start, match.end);
     }
   }
 
   function parseEndTag (tagName, start, end) {
     var pos, lowerCasedTagName;
     if (start == null) { start = index; }
     if (end == null) { end = index; }
 
     if (tagName) {
       lowerCasedTagName = tagName.toLowerCase();
     }
 
     // Find the closest opened tag of the same type
     if (tagName) {
       for (pos = stack.length - 1; pos >= 0; pos--) {
         if (stack[pos].lowerCasedTag === lowerCasedTagName) {
           break
         }
       }
     } else {
       // If no tag name is provided, clean shop
       pos = 0;
     }
 
     if (pos >= 0) {
       // Close all the open elements, up the stack
       for (var i = stack.length - 1; i >= pos; i--) {
         if ("development" !== 'production' &&
           (i > pos || !tagName) &&
           options.warn
         ) {
           options.warn(
             ("tag <" + (stack[i].tag) + "> has no matching end tag.")
           );
         }
         if (options.end) {
           options.end(stack[i].tag, start, end);
         }
       }
 
       // Remove the open elements from the stack
       stack.length = pos;
       lastTag = pos && stack[pos - 1].tag;
     } else if (lowerCasedTagName === 'br') {
       if (options.start) {
         options.start(tagName, [], true, start, end);
       }
     } else if (lowerCasedTagName === 'p') {
       if (options.start) {
         options.start(tagName, [], false, start, end);
       }
       if (options.end) {
         options.end(tagName, start, end);
       }
     }
   }
 }
 
 /*  */
 
 var onRE = /^@|^v-on:/;
 var dirRE = /^v-|^@|^:/;
 var forAliasRE = /(.*?)\s+(?:in|of)\s+(.*)/;
 var forIteratorRE = /\((\{[^}]*\}|[^,]*),([^,]*)(?:,([^,]*))?\)/;
 
 var argRE = /:(.*)$/;
 var bindRE = /^:|^v-bind:/;
 var modifierRE = /\.[^.]+/g;
 
 var decodeHTMLCached = cached(he.decode);
 
 // configurable state
 var warn$2;
 var delimiters;
 var transforms;
 var preTransforms;
 var postTransforms;
 var platformIsPreTag;
 var platformMustUseProp;
 var platformGetTagNamespace;
 
 /**
  * Convert HTML string to AST.
  */
 function parse (
   template,
   options
 ) {
   warn$2 = options.warn || baseWarn;
 
   platformIsPreTag = options.isPreTag || no;
   platformMustUseProp = options.mustUseProp || no;
   platformGetTagNamespace = options.getTagNamespace || no;
 
   transforms = pluckModuleFunction(options.modules, 'transformNode');
   preTransforms = pluckModuleFunction(options.modules, 'preTransformNode');
   postTransforms = pluckModuleFunction(options.modules, 'postTransformNode');
 
   delimiters = options.delimiters;
 
   var stack = [];
   var preserveWhitespace = options.preserveWhitespace !== false;
   var root;
   var currentParent;
   var inVPre = false;
   var inPre = false;
   var warned = false;
 
   function warnOnce (msg) {
     if (!warned) {
       warned = true;
       warn$2(msg);
     }
   }
 
   function endPre (element) {
     // check pre state
     if (element.pre) {
       inVPre = false;
     }
     if (platformIsPreTag(element.tag)) {
       inPre = false;
     }
   }
 
   parseHTML(template, {
     warn: warn$2,
     expectHTML: options.expectHTML,
     isUnaryTag: options.isUnaryTag,
     canBeLeftOpenTag: options.canBeLeftOpenTag,
     shouldDecodeNewlines: options.shouldDecodeNewlines,
     shouldKeepComment: options.comments,
     start: function start (tag, attrs, unary) {
       // check namespace.
       // inherit parent ns if there is one
       var ns = (currentParent && currentParent.ns) || platformGetTagNamespace(tag);
 
       // handle IE svg bug
       /* istanbul ignore if */
       if (isIE && ns === 'svg') {
         attrs = guardIESVGBug(attrs);
       }
 
       var element = {
         type: 1,
         tag: tag,
         attrsList: attrs,
         attrsMap: makeAttrsMap(attrs),
         parent: currentParent,
         children: []
       };
       if (ns) {
         element.ns = ns;
       }
 
       if (isForbiddenTag(element) && !isServerRendering()) {
         element.forbidden = true;
         "development" !== 'production' && warn$2(
           'Templates should only be responsible for mapping the state to the ' +
           'UI. Avoid placing tags with side-effects in your templates, such as ' +
           "<" + tag + ">" + ', as they will not be parsed.'
         );
       }
 
       // apply pre-transforms
       for (var i = 0; i < preTransforms.length; i++) {
         preTransforms[i](element, options);
       }
 
       if (!inVPre) {
         processPre(element);
         if (element.pre) {
           inVPre = true;
         }
       }
       if (platformIsPreTag(element.tag)) {
         inPre = true;
       }
       if (inVPre) {
         processRawAttrs(element);
       } else {
         processFor(element);
         processIf(element);
         processOnce(element);
         processKey(element);
 
         // determine whether this is a plain element after
         // removing structural attributes
         element.plain = !element.key && !attrs.length;
 
         processRef(element);
         processSlot(element);
         processComponent(element);
         for (var i$1 = 0; i$1 < transforms.length; i$1++) {
           transforms[i$1](element, options);
         }
         processAttrs(element);
       }
 
       function checkRootConstraints (el) {
         {
           if (el.tag === 'slot' || el.tag === 'template') {
             warnOnce(
               "Cannot use <" + (el.tag) + "> as component root element because it may " +
               'contain multiple nodes.'
             );
           }
           if (el.attrsMap.hasOwnProperty('v-for')) {
             warnOnce(
               'Cannot use v-for on stateful component root element because ' +
               'it renders multiple elements.'
             );
           }
         }
       }
 
       // tree management
       if (!root) {
         root = element;
         checkRootConstraints(root);
       } else if (!stack.length) {
         // allow root elements with v-if, v-else-if and v-else
         if (root.if && (element.elseif || element.else)) {
           checkRootConstraints(element);
           addIfCondition(root, {
             exp: element.elseif,
             block: element
           });
         } else {
           warnOnce(
             "Component template should contain exactly one root element. " +
             "If you are using v-if on multiple elements, " +
             "use v-else-if to chain them instead."
           );
         }
       }
       if (currentParent && !element.forbidden) {
         if (element.elseif || element.else) {
           processIfConditions(element, currentParent);
         } else if (element.slotScope) { // scoped slot
           currentParent.plain = false;
           var name = element.slotTarget || '"default"';(currentParent.scopedSlots || (currentParent.scopedSlots = {}))[name] = element;
         } else {
           currentParent.children.push(element);
           element.parent = currentParent;
         }
       }
       if (!unary) {
         currentParent = element;
         stack.push(element);
       } else {
         endPre(element);
       }
       // apply post-transforms
       for (var i$2 = 0; i$2 < postTransforms.length; i$2++) {
         postTransforms[i$2](element, options);
       }
     },
 
     end: function end () {
       // remove trailing whitespace
       var element = stack[stack.length - 1];
       var lastNode = element.children[element.children.length - 1];
       if (lastNode && lastNode.type === 3 && lastNode.text === ' ' && !inPre) {
         element.children.pop();
       }
       // pop stack
       stack.length -= 1;
       currentParent = stack[stack.length - 1];
       endPre(element);
     },
 
     chars: function chars (text) {
       if (!currentParent) {
         {
           if (text === template) {
             warnOnce(
               'Component template requires a root element, rather than just text.'
             );
           } else if ((text = text.trim())) {
             warnOnce(
               ("text \"" + text + "\" outside root element will be ignored.")
             );
           }
         }
         return
       }
       // IE textarea placeholder bug
       /* istanbul ignore if */
       if (isIE &&
         currentParent.tag === 'textarea' &&
         currentParent.attrsMap.placeholder === text
       ) {
         return
       }
       var children = currentParent.children;
       text = inPre || text.trim()
         ? isTextTag(currentParent) ? text : decodeHTMLCached(text)
         // only preserve whitespace if its not right after a starting tag
         : preserveWhitespace && children.length ? ' ' : '';
       if (text) {
         var expression;
         if (!inVPre && text !== ' ' && (expression = parseText(text, delimiters))) {
           children.push({
             type: 2,
             expression: expression,
             text: text
           });
         } else if (text !== ' ' || !children.length || children[children.length - 1].text !== ' ') {
           children.push({
             type: 3,
             text: text
           });
         }
       }
     },
     comment: function comment (text) {
       currentParent.children.push({
         type: 3,
         text: text,
         isComment: true
       });
     }
   });
   return root
 }
 
 function processPre (el) {
   if (getAndRemoveAttr(el, 'v-pre') != null) {
     el.pre = true;
   }
 }
 
 function processRawAttrs (el) {
   var l = el.attrsList.length;
   if (l) {
     var attrs = el.attrs = new Array(l);
     for (var i = 0; i < l; i++) {
       attrs[i] = {
         name: el.attrsList[i].name,
         value: JSON.stringify(el.attrsList[i].value)
       };
     }
   } else if (!el.pre) {
     // non root node in pre blocks with no attributes
     el.plain = true;
   }
 }
 
 function processKey (el) {
   var exp = getBindingAttr(el, 'key');
   if (exp) {
     if ("development" !== 'production' && el.tag === 'template') {
       warn$2("<template> cannot be keyed. Place the key on real elements instead.");
     }
     el.key = exp;
   }
 }
 
 function processRef (el) {
   var ref = getBindingAttr(el, 'ref');
   if (ref) {
     el.ref = ref;
     el.refInFor = checkInFor(el);
   }
 }
 
 function processFor (el) {
   var exp;
   if ((exp = getAndRemoveAttr(el, 'v-for'))) {
     var inMatch = exp.match(forAliasRE);
     if (!inMatch) {
       "development" !== 'production' && warn$2(
         ("Invalid v-for expression: " + exp)
       );
       return
     }
     el.for = inMatch[2].trim();
     var alias = inMatch[1].trim();
     var iteratorMatch = alias.match(forIteratorRE);
     if (iteratorMatch) {
       el.alias = iteratorMatch[1].trim();
       el.iterator1 = iteratorMatch[2].trim();
       if (iteratorMatch[3]) {
         el.iterator2 = iteratorMatch[3].trim();
       }
     } else {
       el.alias = alias;
     }
   }
 }
 
 function processIf (el) {
   var exp = getAndRemoveAttr(el, 'v-if');
   if (exp) {
     el.if = exp;
     addIfCondition(el, {
       exp: exp,
       block: el
     });
   } else {
     if (getAndRemoveAttr(el, 'v-else') != null) {
       el.else = true;
     }
     var elseif = getAndRemoveAttr(el, 'v-else-if');
     if (elseif) {
       el.elseif = elseif;
     }
   }
 }
 
 function processIfConditions (el, parent) {
   var prev = findPrevElement(parent.children);
   if (prev && prev.if) {
     addIfCondition(prev, {
       exp: el.elseif,
       block: el
     });
   } else {
     warn$2(
       "v-" + (el.elseif ? ('else-if="' + el.elseif + '"') : 'else') + " " +
       "used on element <" + (el.tag) + "> without corresponding v-if."
     );
   }
 }
 
 function findPrevElement (children) {
   var i = children.length;
   while (i--) {
     if (children[i].type === 1) {
       return children[i]
     } else {
       if ("development" !== 'production' && children[i].text !== ' ') {
         warn$2(
           "text \"" + (children[i].text.trim()) + "\" between v-if and v-else(-if) " +
           "will be ignored."
         );
       }
       children.pop();
     }
   }
 }
 
 function addIfCondition (el, condition) {
   if (!el.ifConditions) {
     el.ifConditions = [];
   }
   el.ifConditions.push(condition);
 }
 
 function processOnce (el) {
   var once$$1 = getAndRemoveAttr(el, 'v-once');
   if (once$$1 != null) {
     el.once = true;
   }
 }
 
 function processSlot (el) {
   if (el.tag === 'slot') {
     el.slotName = getBindingAttr(el, 'name');
     if ("development" !== 'production' && el.key) {
       warn$2(
         "`key` does not work on <slot> because slots are abstract outlets " +
         "and can possibly expand into multiple elements. " +
         "Use the key on a wrapping element instead."
       );
     }
   } else {
     var slotTarget = getBindingAttr(el, 'slot');
     if (slotTarget) {
       el.slotTarget = slotTarget === '""' ? '"default"' : slotTarget;
     }
     if (el.tag === 'template') {
       el.slotScope = getAndRemoveAttr(el, 'scope');
     }
   }
 }
 
 function processComponent (el) {
   var binding;
   if ((binding = getBindingAttr(el, 'is'))) {
     el.component = binding;
   }
   if (getAndRemoveAttr(el, 'inline-template') != null) {
     el.inlineTemplate = true;
   }
 }
 
 function processAttrs (el) {
   var list = el.attrsList;
   var i, l, name, rawName, value, modifiers, isProp;
   for (i = 0, l = list.length; i < l; i++) {
     name = rawName = list[i].name;
     value = list[i].value;
     if (dirRE.test(name)) {
       // mark element as dynamic
       el.hasBindings = true;
       // modifiers
       modifiers = parseModifiers(name);
       if (modifiers) {
         name = name.replace(modifierRE, '');
       }
       if (bindRE.test(name)) { // v-bind
         name = name.replace(bindRE, '');
         value = parseFilters(value);
         isProp = false;
         if (modifiers) {
           if (modifiers.prop) {
             isProp = true;
             name = camelize(name);
             if (name === 'innerHtml') { name = 'innerHTML'; }
           }
           if (modifiers.camel) {
             name = camelize(name);
           }
           if (modifiers.sync) {
             addHandler(
               el,
               ("update:" + (camelize(name))),
               genAssignmentCode(value, "$event")
             );
           }
         }
         if (!el.component && (
           isProp || platformMustUseProp(el.tag, el.attrsMap.type, name)
         )) {
           addProp(el, name, value);
         } else {
           addAttr(el, name, value);
         }
       } else if (onRE.test(name)) { // v-on
         name = name.replace(onRE, '');
         addHandler(el, name, value, modifiers, false, warn$2);
       } else { // normal directives
         name = name.replace(dirRE, '');
         // parse arg
         var argMatch = name.match(argRE);
         var arg = argMatch && argMatch[1];
         if (arg) {
           name = name.slice(0, -(arg.length + 1));
         }
         addDirective(el, name, rawName, value, arg, modifiers);
         if ("development" !== 'production' && name === 'model') {
           checkForAliasModel(el, value);
         }
       }
     } else {
       // literal attribute
       {
         var expression = parseText(value, delimiters);
         if (expression) {
           warn$2(
             name + "=\"" + value + "\": " +
             'Interpolation inside attributes has been removed. ' +
             'Use v-bind or the colon shorthand instead. For example, ' +
             'instead of <div id="{{ val }}">, use <div :id="val">.'
           );
         }
       }
       addAttr(el, name, JSON.stringify(value));
     }
   }
 }
 
 function checkInFor (el) {
   var parent = el;
   while (parent) {
     if (parent.for !== undefined) {
       return true
     }
     parent = parent.parent;
   }
   return false
 }
 
 function parseModifiers (name) {
   var match = name.match(modifierRE);
   if (match) {
     var ret = {};
     match.forEach(function (m) { ret[m.slice(1)] = true; });
     return ret
   }
 }
 
 function makeAttrsMap (attrs) {
   var map = {};
   for (var i = 0, l = attrs.length; i < l; i++) {
     if (
       "development" !== 'production' &&
       map[attrs[i].name] && !isIE && !isEdge
     ) {
       warn$2('duplicate attribute: ' + attrs[i].name);
     }
     map[attrs[i].name] = attrs[i].value;
   }
   return map
 }
 
 // for script (e.g. type="x/template") or style, do not decode content
 function isTextTag (el) {
   return el.tag === 'script' || el.tag === 'style'
 }
 
 function isForbiddenTag (el) {
   return (
     el.tag === 'style' ||
     (el.tag === 'script' && (
       !el.attrsMap.type ||
       el.attrsMap.type === 'text/javascript'
     ))
   )
 }
 
 var ieNSBug = /^xmlns:NS\d+/;
 var ieNSPrefix = /^NS\d+:/;
 
 /* istanbul ignore next */
 function guardIESVGBug (attrs) {
   var res = [];
   for (var i = 0; i < attrs.length; i++) {
     var attr = attrs[i];
     if (!ieNSBug.test(attr.name)) {
       attr.name = attr.name.replace(ieNSPrefix, '');
       res.push(attr);
     }
   }
   return res
 }
 
 function checkForAliasModel (el, value) {
   var _el = el;
   while (_el) {
     if (_el.for && _el.alias === value) {
       warn$2(
         "<" + (el.tag) + " v-model=\"" + value + "\">: " +
         "You are binding v-model directly to a v-for iteration alias. " +
         "This will not be able to modify the v-for source array because " +
         "writing to the alias is like modifying a function local variable. " +
         "Consider using an array of objects and use v-model on an object property instead."
       );
     }
     _el = _el.parent;
   }
 }
 
 /*  */
 
 var isStaticKey;
 var isPlatformReservedTag;
 
 var genStaticKeysCached = cached(genStaticKeys$1);
 
 /**
  * Goal of the optimizer: walk the generated template AST tree
  * and detect sub-trees that are purely static, i.e. parts of
  * the DOM that never needs to change.
  *
  * Once we detect these sub-trees, we can:
  *
  * 1. Hoist them into constants, so that we no longer need to
  *    create fresh nodes for them on each re-render;
  * 2. Completely skip them in the patching process.
  */
 function optimize (root, options) {
   if (!root) { return }
   isStaticKey = genStaticKeysCached(options.staticKeys || '');
   isPlatformReservedTag = options.isReservedTag || no;
   // first pass: mark all non-static nodes.
   markStatic$1(root);
   // second pass: mark static roots.
   markStaticRoots(root, false);
 }
 
 function genStaticKeys$1 (keys) {
   return makeMap(
     'type,tag,attrsList,attrsMap,plain,parent,children,attrs' +
     (keys ? ',' + keys : '')
   )
 }
 
 function markStatic$1 (node) {
   node.static = isStatic(node);
   if (node.type === 1) {
     // do not make component slot content static. this avoids
     // 1. components not able to mutate slot nodes
     // 2. static slot content fails for hot-reloading
     if (
       !isPlatformReservedTag(node.tag) &&
       node.tag !== 'slot' &&
       node.attrsMap['inline-template'] == null
     ) {
       return
     }
     for (var i = 0, l = node.children.length; i < l; i++) {
       var child = node.children[i];
       markStatic$1(child);
       if (!child.static) {
         node.static = false;
       }
     }
     if (node.ifConditions) {
       for (var i$1 = 1, l$1 = node.ifConditions.length; i$1 < l$1; i$1++) {
         var block = node.ifConditions[i$1].block;
         markStatic$1(block);
         if (!block.static) {
           node.static = false;
         }
       }
     }
   }
 }
 
 function markStaticRoots (node, isInFor) {
   if (node.type === 1) {
     if (node.static || node.once) {
       node.staticInFor = isInFor;
     }
     // For a node to qualify as a static root, it should have children that
     // are not just static text. Otherwise the cost of hoisting out will
     // outweigh the benefits and it's better off to just always render it fresh.
     if (node.static && node.children.length && !(
       node.children.length === 1 &&
       node.children[0].type === 3
     )) {
       node.staticRoot = true;
       return
     } else {
       node.staticRoot = false;
     }
     if (node.children) {
       for (var i = 0, l = node.children.length; i < l; i++) {
         markStaticRoots(node.children[i], isInFor || !!node.for);
       }
     }
     if (node.ifConditions) {
       for (var i$1 = 1, l$1 = node.ifConditions.length; i$1 < l$1; i$1++) {
         markStaticRoots(node.ifConditions[i$1].block, isInFor);
       }
     }
   }
 }
 
 function isStatic (node) {
   if (node.type === 2) { // expression
     return false
   }
   if (node.type === 3) { // text
     return true
   }
   return !!(node.pre || (
     !node.hasBindings && // no dynamic bindings
     !node.if && !node.for && // not v-if or v-for or v-else
     !isBuiltInTag(node.tag) && // not a built-in
     isPlatformReservedTag(node.tag) && // not a component
     !isDirectChildOfTemplateFor(node) &&
     Object.keys(node).every(isStaticKey)
   ))
 }
 
 function isDirectChildOfTemplateFor (node) {
   while (node.parent) {
     node = node.parent;
     if (node.tag !== 'template') {
       return false
     }
     if (node.for) {
       return true
     }
   }
   return false
 }
 
 /*  */
 
 var fnExpRE = /^\s*([\w$_]+|\([^)]*?\))\s*=>|^function\s*\(/;
 var simplePathRE = /^\s*[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\['.*?']|\[".*?"]|\[\d+]|\[[A-Za-z_$][\w$]*])*\s*$/;
 
 // keyCode aliases
 var keyCodes = {
   esc: 27,
   tab: 9,
   enter: 13,
   space: 32,
   up: 38,
   left: 37,
   right: 39,
   down: 40,
   'delete': [8, 46]
 };
 
 // #4868: modifiers that prevent the execution of the listener
 // need to explicitly return null so that we can determine whether to remove
 // the listener for .once
 var genGuard = function (condition) { return ("if(" + condition + ")return null;"); };
 
 var modifierCode = {
   stop: '$event.stopPropagation();',
   prevent: '$event.preventDefault();',
   self: genGuard("$event.target !== $event.currentTarget"),
   ctrl: genGuard("!$event.ctrlKey"),
   shift: genGuard("!$event.shiftKey"),
   alt: genGuard("!$event.altKey"),
   meta: genGuard("!$event.metaKey"),
   left: genGuard("'button' in $event && $event.button !== 0"),
   middle: genGuard("'button' in $event && $event.button !== 1"),
   right: genGuard("'button' in $event && $event.button !== 2")
 };
 
 function genHandlers (
   events,
   isNative,
   warn
 ) {
   var res = isNative ? 'nativeOn:{' : 'on:{';
   for (var name in events) {
     var handler = events[name];
     // #5330: warn click.right, since right clicks do not actually fire click events.
     if ("development" !== 'production' &&
       name === 'click' &&
       handler && handler.modifiers && handler.modifiers.right
     ) {
       warn(
         "Use \"contextmenu\" instead of \"click.right\" since right clicks " +
         "do not actually fire \"click\" events."
       );
     }
     res += "\"" + name + "\":" + (genHandler(name, handler)) + ",";
   }
   return res.slice(0, -1) + '}'
 }
 
 function genHandler (
   name,
   handler
 ) {
   if (!handler) {
     return 'function(){}'
   }
 
   if (Array.isArray(handler)) {
     return ("[" + (handler.map(function (handler) { return genHandler(name, handler); }).join(',')) + "]")
   }
 
   var isMethodPath = simplePathRE.test(handler.value);
   var isFunctionExpression = fnExpRE.test(handler.value);
 
   if (!handler.modifiers) {
     return isMethodPath || isFunctionExpression
       ? handler.value
       : ("function($event){" + (handler.value) + "}") // inline statement
   } else {
     var code = '';
     var genModifierCode = '';
     var keys = [];
     for (var key in handler.modifiers) {
       if (modifierCode[key]) {
         genModifierCode += modifierCode[key];
         // left/right
         if (keyCodes[key]) {
           keys.push(key);
         }
       } else {
         keys.push(key);
       }
     }
     if (keys.length) {
       code += genKeyFilter(keys);
     }
     // Make sure modifiers like prevent and stop get executed after key filtering
     if (genModifierCode) {
       code += genModifierCode;
     }
     var handlerCode = isMethodPath
       ? handler.value + '($event)'
       : isFunctionExpression
         ? ("(" + (handler.value) + ")($event)")
         : handler.value;
     return ("function($event){" + code + handlerCode + "}")
   }
 }
 
 function genKeyFilter (keys) {
   return ("if(!('button' in $event)&&" + (keys.map(genFilterCode).join('&&')) + ")return null;")
 }
 
 function genFilterCode (key) {
   var keyVal = parseInt(key, 10);
   if (keyVal) {
     return ("$event.keyCode!==" + keyVal)
   }
   var alias = keyCodes[key];
   return ("_k($event.keyCode," + (JSON.stringify(key)) + (alias ? ',' + JSON.stringify(alias) : '') + ")")
 }
 
 /*  */
 
 function on (el, dir) {
   if ("development" !== 'production' && dir.modifiers) {
     warn("v-on without argument does not support modifiers.");
   }
   el.wrapListeners = function (code) { return ("_g(" + code + "," + (dir.value) + ")"); };
 }
 
 /*  */
 
 function bind$1 (el, dir) {
   el.wrapData = function (code) {
     return ("_b(" + code + ",'" + (el.tag) + "'," + (dir.value) + "," + (dir.modifiers && dir.modifiers.prop ? 'true' : 'false') + (dir.modifiers && dir.modifiers.sync ? ',true' : '') + ")")
   };
 }
 
 /*  */
 
 var baseDirectives = {
   on: on,
   bind: bind$1,
   cloak: noop
 };
 
 /*  */
 
 var CodegenState = function CodegenState (options) {
   this.options = options;
   this.warn = options.warn || baseWarn;
   this.transforms = pluckModuleFunction(options.modules, 'transformCode');
   this.dataGenFns = pluckModuleFunction(options.modules, 'genData');
   this.directives = extend(extend({}, baseDirectives), options.directives);
   var isReservedTag = options.isReservedTag || no;
   this.maybeComponent = function (el) { return !isReservedTag(el.tag); };
   this.onceId = 0;
   this.staticRenderFns = [];
 };
 
 
 
 function generate (
   ast,
   options
 ) {
   var state = new CodegenState(options);
   var code = ast ? genElement(ast, state) : '_c("div")';
   return {
     render: ("with(this){return " + code + "}"),
     staticRenderFns: state.staticRenderFns
   }
 }
 
 function genElement (el, state) {
   if (el.staticRoot && !el.staticProcessed) {
     return genStatic(el, state)
   } else if (el.once && !el.onceProcessed) {
     return genOnce(el, state)
   } else if (el.for && !el.forProcessed) {
     return genFor(el, state)
   } else if (el.if && !el.ifProcessed) {
     return genIf(el, state)
   } else if (el.tag === 'template' && !el.slotTarget) {
     return genChildren(el, state) || 'void 0'
   } else if (el.tag === 'slot') {
     return genSlot(el, state)
   } else {
     // component or element
     var code;
     if (el.component) {
       code = genComponent(el.component, el, state);
     } else {
       var data = el.plain ? undefined : genData$2(el, state);
 
       var children = el.inlineTemplate ? null : genChildren(el, state, true);
       code = "_c('" + (el.tag) + "'" + (data ? ("," + data) : '') + (children ? ("," + children) : '') + ")";
     }
     // module transforms
     for (var i = 0; i < state.transforms.length; i++) {
       code = state.transforms[i](el, code);
     }
     return code
   }
 }
 
 // hoist static sub-trees out
 function genStatic (el, state) {
   el.staticProcessed = true;
   state.staticRenderFns.push(("with(this){return " + (genElement(el, state)) + "}"));
   return ("_m(" + (state.staticRenderFns.length - 1) + (el.staticInFor ? ',true' : '') + ")")
 }
 
 // v-once
 function genOnce (el, state) {
   el.onceProcessed = true;
   if (el.if && !el.ifProcessed) {
     return genIf(el, state)
   } else if (el.staticInFor) {
     var key = '';
     var parent = el.parent;
     while (parent) {
       if (parent.for) {
         key = parent.key;
         break
       }
       parent = parent.parent;
     }
     if (!key) {
       "development" !== 'production' && state.warn(
         "v-once can only be used inside v-for that is keyed. "
       );
       return genElement(el, state)
     }
     return ("_o(" + (genElement(el, state)) + "," + (state.onceId++) + (key ? ("," + key) : "") + ")")
   } else {
     return genStatic(el, state)
   }
 }
 
 function genIf (
   el,
   state,
   altGen,
   altEmpty
 ) {
   el.ifProcessed = true; // avoid recursion
   return genIfConditions(el.ifConditions.slice(), state, altGen, altEmpty)
 }
 
 function genIfConditions (
   conditions,
   state,
   altGen,
   altEmpty
 ) {
   if (!conditions.length) {
     return altEmpty || '_e()'
   }
 
   var condition = conditions.shift();
   if (condition.exp) {
     return ("(" + (condition.exp) + ")?" + (genTernaryExp(condition.block)) + ":" + (genIfConditions(conditions, state, altGen, altEmpty)))
   } else {
     return ("" + (genTernaryExp(condition.block)))
   }
 
   // v-if with v-once should generate code like (a)?_m(0):_m(1)
   function genTernaryExp (el) {
     return altGen
       ? altGen(el, state)
       : el.once
         ? genOnce(el, state)
         : genElement(el, state)
   }
 }
 
 function genFor (
   el,
   state,
   altGen,
   altHelper
 ) {
   var exp = el.for;
   var alias = el.alias;
   var iterator1 = el.iterator1 ? ("," + (el.iterator1)) : '';
   var iterator2 = el.iterator2 ? ("," + (el.iterator2)) : '';
 
   if ("development" !== 'production' &&
     state.maybeComponent(el) &&
     el.tag !== 'slot' &&
     el.tag !== 'template' &&
     !el.key
   ) {
     state.warn(
       "<" + (el.tag) + " v-for=\"" + alias + " in " + exp + "\">: component lists rendered with " +
       "v-for should have explicit keys. " +
       "See https://vuejs.org/guide/list.html#key for more info.",
       true /* tip */
     );
   }
 
   el.forProcessed = true; // avoid recursion
   return (altHelper || '_l') + "((" + exp + ")," +
     "function(" + alias + iterator1 + iterator2 + "){" +
       "return " + ((altGen || genElement)(el, state)) +
     '})'
 }
 
 function genData$2 (el, state) {
   var data = '{';
 
   // directives first.
   // directives may mutate the el's other properties before they are generated.
   var dirs = genDirectives(el, state);
   if (dirs) { data += dirs + ','; }
 
   // key
   if (el.key) {
     data += "key:" + (el.key) + ",";
   }
   // ref
   if (el.ref) {
     data += "ref:" + (el.ref) + ",";
   }
   if (el.refInFor) {
     data += "refInFor:true,";
   }
   // pre
   if (el.pre) {
     data += "pre:true,";
   }
   // record original tag name for components using "is" attribute
   if (el.component) {
     data += "tag:\"" + (el.tag) + "\",";
   }
   // module data generation functions
   for (var i = 0; i < state.dataGenFns.length; i++) {
     data += state.dataGenFns[i](el);
   }
   // attributes
   if (el.attrs) {
     data += "attrs:{" + (genProps(el.attrs)) + "},";
   }
   // DOM props
   if (el.props) {
     data += "domProps:{" + (genProps(el.props)) + "},";
   }
   // event handlers
   if (el.events) {
     data += (genHandlers(el.events, false, state.warn)) + ",";
   }
   if (el.nativeEvents) {
     data += (genHandlers(el.nativeEvents, true, state.warn)) + ",";
   }
   // slot target
   if (el.slotTarget) {
     data += "slot:" + (el.slotTarget) + ",";
   }
   // scoped slots
   if (el.scopedSlots) {
     data += (genScopedSlots(el.scopedSlots, state)) + ",";
   }
   // component v-model
   if (el.model) {
     data += "model:{value:" + (el.model.value) + ",callback:" + (el.model.callback) + ",expression:" + (el.model.expression) + "},";
   }
   // inline-template
   if (el.inlineTemplate) {
     var inlineTemplate = genInlineTemplate(el, state);
     if (inlineTemplate) {
       data += inlineTemplate + ",";
     }
   }
   data = data.replace(/,$/, '') + '}';
   // v-bind data wrap
   if (el.wrapData) {
     data = el.wrapData(data);
   }
   // v-on data wrap
   if (el.wrapListeners) {
     data = el.wrapListeners(data);
   }
   return data
 }
 
 function genDirectives (el, state) {
   var dirs = el.directives;
   if (!dirs) { return }
   var res = 'directives:[';
   var hasRuntime = false;
   var i, l, dir, needRuntime;
   for (i = 0, l = dirs.length; i < l; i++) {
     dir = dirs[i];
     needRuntime = true;
     var gen = state.directives[dir.name];
     if (gen) {
       // compile-time directive that manipulates AST.
       // returns true if it also needs a runtime counterpart.
       needRuntime = !!gen(el, dir, state.warn);
     }
     if (needRuntime) {
       hasRuntime = true;
       res += "{name:\"" + (dir.name) + "\",rawName:\"" + (dir.rawName) + "\"" + (dir.value ? (",value:(" + (dir.value) + "),expression:" + (JSON.stringify(dir.value))) : '') + (dir.arg ? (",arg:\"" + (dir.arg) + "\"") : '') + (dir.modifiers ? (",modifiers:" + (JSON.stringify(dir.modifiers))) : '') + "},";
     }
   }
   if (hasRuntime) {
     return res.slice(0, -1) + ']'
   }
 }
 
 function genInlineTemplate (el, state) {
   var ast = el.children[0];
   if ("development" !== 'production' && (
     el.children.length > 1 || ast.type !== 1
   )) {
     state.warn('Inline-template components must have exactly one child element.');
   }
   if (ast.type === 1) {
     var inlineRenderFns = generate(ast, state.options);
     return ("inlineTemplate:{render:function(){" + (inlineRenderFns.render) + "},staticRenderFns:[" + (inlineRenderFns.staticRenderFns.map(function (code) { return ("function(){" + code + "}"); }).join(',')) + "]}")
   }
 }
 
 function genScopedSlots (
   slots,
   state
 ) {
   return ("scopedSlots:_u([" + (Object.keys(slots).map(function (key) {
       return genScopedSlot(key, slots[key], state)
     }).join(',')) + "])")
 }
 
 function genScopedSlot (
   key,
   el,
   state
 ) {
   if (el.for && !el.forProcessed) {
     return genForScopedSlot(key, el, state)
   }
   return "{key:" + key + ",fn:function(" + (String(el.attrsMap.scope)) + "){" +
     "return " + (el.tag === 'template'
       ? genChildren(el, state) || 'void 0'
       : genElement(el, state)) + "}}"
 }
 
 function genForScopedSlot (
   key,
   el,
   state
 ) {
   var exp = el.for;
   var alias = el.alias;
   var iterator1 = el.iterator1 ? ("," + (el.iterator1)) : '';
   var iterator2 = el.iterator2 ? ("," + (el.iterator2)) : '';
   el.forProcessed = true; // avoid recursion
   return "_l((" + exp + ")," +
     "function(" + alias + iterator1 + iterator2 + "){" +
       "return " + (genScopedSlot(key, el, state)) +
     '})'
 }
 
 function genChildren (
   el,
   state,
   checkSkip,
   altGenElement,
   altGenNode
 ) {
   var children = el.children;
   if (children.length) {
     var el$1 = children[0];
     // optimize single v-for
     if (children.length === 1 &&
       el$1.for &&
       el$1.tag !== 'template' &&
       el$1.tag !== 'slot'
     ) {
       return (altGenElement || genElement)(el$1, state)
     }
     var normalizationType = checkSkip
       ? getNormalizationType(children, state.maybeComponent)
       : 0;
     var gen = altGenNode || genNode;
     return ("[" + (children.map(function (c) { return gen(c, state); }).join(',')) + "]" + (normalizationType ? ("," + normalizationType) : ''))
   }
 }
 
 // determine the normalization needed for the children array.
 // 0: no normalization needed
 // 1: simple normalization needed (possible 1-level deep nested array)
 // 2: full normalization needed
 function getNormalizationType (
   children,
   maybeComponent
 ) {
   var res = 0;
   for (var i = 0; i < children.length; i++) {
     var el = children[i];
     if (el.type !== 1) {
       continue
     }
     if (needsNormalization(el) ||
         (el.ifConditions && el.ifConditions.some(function (c) { return needsNormalization(c.block); }))) {
       res = 2;
       break
     }
     if (maybeComponent(el) ||
         (el.ifConditions && el.ifConditions.some(function (c) { return maybeComponent(c.block); }))) {
       res = 1;
     }
   }
   return res
 }
 
 function needsNormalization (el) {
   return el.for !== undefined || el.tag === 'template' || el.tag === 'slot'
 }
 
 function genNode (node, state) {
   if (node.type === 1) {
     return genElement(node, state)
   } if (node.type === 3 && node.isComment) {
     return genComment(node)
   } else {
     return genText(node)
   }
 }
 
 function genText (text) {
   return ("_v(" + (text.type === 2
     ? text.expression // no need for () because already wrapped in _s()
     : transformSpecialNewlines(JSON.stringify(text.text))) + ")")
 }
 
 function genComment (comment) {
   return ("_e('" + (comment.text) + "')")
 }
 
 function genSlot (el, state) {
   var slotName = el.slotName || '"default"';
   var children = genChildren(el, state);
   var res = "_t(" + slotName + (children ? ("," + children) : '');
   var attrs = el.attrs && ("{" + (el.attrs.map(function (a) { return ((camelize(a.name)) + ":" + (a.value)); }).join(',')) + "}");
   var bind$$1 = el.attrsMap['v-bind'];
   if ((attrs || bind$$1) && !children) {
     res += ",null";
   }
   if (attrs) {
     res += "," + attrs;
   }
   if (bind$$1) {
     res += (attrs ? '' : ',null') + "," + bind$$1;
   }
   return res + ')'
 }
 
 // componentName is el.component, take it as argument to shun flow's pessimistic refinement
 function genComponent (
   componentName,
   el,
   state
 ) {
   var children = el.inlineTemplate ? null : genChildren(el, state, true);
   return ("_c(" + componentName + "," + (genData$2(el, state)) + (children ? ("," + children) : '') + ")")
 }
 
 function genProps (props) {
   var res = '';
   for (var i = 0; i < props.length; i++) {
     var prop = props[i];
     res += "\"" + (prop.name) + "\":" + (transformSpecialNewlines(prop.value)) + ",";
   }
   return res.slice(0, -1)
 }
 
 // #3895, #4268
 function transformSpecialNewlines (text) {
   return text
     .replace(/\u2028/g, '\\u2028')
     .replace(/\u2029/g, '\\u2029')
 }
 
 /*  */
 
 // these keywords should not appear inside expressions, but operators like
 // typeof, instanceof and in are allowed
 var prohibitedKeywordRE = new RegExp('\\b' + (
   'do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,' +
   'super,throw,while,yield,delete,export,import,return,switch,default,' +
   'extends,finally,continue,debugger,function,arguments'
 ).split(',').join('\\b|\\b') + '\\b');
 
 // these unary operators should not be used as property/method names
 var unaryOperatorsRE = new RegExp('\\b' + (
   'delete,typeof,void'
 ).split(',').join('\\s*\\([^\\)]*\\)|\\b') + '\\s*\\([^\\)]*\\)');
 
 // check valid identifier for v-for
 var identRE = /[A-Za-z_$][\w$]*/;
 
 // strip strings in expressions
 var stripStringRE = /'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"|`(?:[^`\\]|\\.)*\$\{|\}(?:[^`\\]|\\.)*`|`(?:[^`\\]|\\.)*`/g;
 
 // detect problematic expressions in a template
 function detectErrors (ast) {
   var errors = [];
   if (ast) {
     checkNode(ast, errors);
   }
   return errors
 }
 
 function checkNode (node, errors) {
   if (node.type === 1) {
     for (var name in node.attrsMap) {
       if (dirRE.test(name)) {
         var value = node.attrsMap[name];
         if (value) {
           if (name === 'v-for') {
             checkFor(node, ("v-for=\"" + value + "\""), errors);
           } else if (onRE.test(name)) {
             checkEvent(value, (name + "=\"" + value + "\""), errors);
           } else {
             checkExpression(value, (name + "=\"" + value + "\""), errors);
           }
         }
       }
     }
     if (node.children) {
       for (var i = 0; i < node.children.length; i++) {
         checkNode(node.children[i], errors);
       }
     }
   } else if (node.type === 2) {
     checkExpression(node.expression, node.text, errors);
   }
 }
 
 function checkEvent (exp, text, errors) {
   var stipped = exp.replace(stripStringRE, '');
   var keywordMatch = stipped.match(unaryOperatorsRE);
   if (keywordMatch && stipped.charAt(keywordMatch.index - 1) !== '$') {
     errors.push(
       "avoid using JavaScript unary operator as property name: " +
       "\"" + (keywordMatch[0]) + "\" in expression " + (text.trim())
     );
   }
   checkExpression(exp, text, errors);
 }
 
 function checkFor (node, text, errors) {
   checkExpression(node.for || '', text, errors);
   checkIdentifier(node.alias, 'v-for alias', text, errors);
   checkIdentifier(node.iterator1, 'v-for iterator', text, errors);
   checkIdentifier(node.iterator2, 'v-for iterator', text, errors);
 }
 
 function checkIdentifier (ident, type, text, errors) {
   if (typeof ident === 'string' && !identRE.test(ident)) {
     errors.push(("invalid " + type + " \"" + ident + "\" in expression: " + (text.trim())));
   }
 }
 
 function checkExpression (exp, text, errors) {
   try {
     new Function(("return " + exp));
   } catch (e) {
     var keywordMatch = exp.replace(stripStringRE, '').match(prohibitedKeywordRE);
     if (keywordMatch) {
       errors.push(
         "avoid using JavaScript keyword as property name: " +
         "\"" + (keywordMatch[0]) + "\" in expression " + (text.trim())
       );
     } else {
       errors.push(("invalid expression: " + (text.trim())));
     }
   }
 }
 
 /*  */
 
 function createFunction (code, errors) {
   try {
     return new Function(code)
   } catch (err) {
     errors.push({ err: err, code: code });
     return noop
   }
 }
 
 function createCompileToFunctionFn (compile) {
   var cache = Object.create(null);
 
   return function compileToFunctions (
     template,
     options,
     vm
   ) {
     options = options || {};
 
     /* istanbul ignore if */
     {
       // detect possible CSP restriction
       try {
         new Function('return 1');
       } catch (e) {
         if (e.toString().match(/unsafe-eval|CSP/)) {
           warn(
             'It seems you are using the standalone build of Vue.js in an ' +
             'environment with Content Security Policy that prohibits unsafe-eval. ' +
             'The template compiler cannot work in this environment. Consider ' +
             'relaxing the policy to allow unsafe-eval or pre-compiling your ' +
             'templates into render functions.'
           );
         }
       }
     }
 
     // check cache
     var key = options.delimiters
       ? String(options.delimiters) + template
       : template;
     if (cache[key]) {
       return cache[key]
     }
 
     // compile
     var compiled = compile(template, options);
 
     // check compilation errors/tips
     {
       if (compiled.errors && compiled.errors.length) {
         warn(
           "Error compiling template:\n\n" + template + "\n\n" +
           compiled.errors.map(function (e) { return ("- " + e); }).join('\n') + '\n',
           vm
         );
       }
       if (compiled.tips && compiled.tips.length) {
         compiled.tips.forEach(function (msg) { return tip(msg, vm); });
       }
     }
 
     // turn code into functions
     var res = {};
     var fnGenErrors = [];
     res.render = createFunction(compiled.render, fnGenErrors);
     res.staticRenderFns = compiled.staticRenderFns.map(function (code) {
       return createFunction(code, fnGenErrors)
     });
 
     // check function generation errors.
     // this should only happen if there is a bug in the compiler itself.
     // mostly for codegen development use
     /* istanbul ignore if */
     {
       if ((!compiled.errors || !compiled.errors.length) && fnGenErrors.length) {
         warn(
           "Failed to generate render function:\n\n" +
           fnGenErrors.map(function (ref) {
             var err = ref.err;
             var code = ref.code;
 
             return ((err.toString()) + " in\n\n" + code + "\n");
         }).join('\n'),
           vm
         );
       }
     }
 
     return (cache[key] = res)
   }
 }
 
 /*  */
 
 function createCompilerCreator (baseCompile) {
   return function createCompiler (baseOptions) {
     function compile (
       template,
       options
     ) {
       var finalOptions = Object.create(baseOptions);
       var errors = [];
       var tips = [];
       finalOptions.warn = function (msg, tip) {
         (tip ? tips : errors).push(msg);
       };
 
       if (options) {
         // merge custom modules
         if (options.modules) {
           finalOptions.modules =
             (baseOptions.modules || []).concat(options.modules);
         }
         // merge custom directives
         if (options.directives) {
           finalOptions.directives = extend(
             Object.create(baseOptions.directives),
             options.directives
           );
         }
         // copy other options
         for (var key in options) {
           if (key !== 'modules' && key !== 'directives') {
             finalOptions[key] = options[key];
           }
         }
       }
 
       var compiled = baseCompile(template, finalOptions);
       {
         errors.push.apply(errors, detectErrors(compiled.ast));
       }
       compiled.errors = errors;
       compiled.tips = tips;
       return compiled
     }
 
     return {
       compile: compile,
       compileToFunctions: createCompileToFunctionFn(compile)
     }
   }
 }
 
 /*  */
 
 // `createCompilerCreator` allows creating compilers that use alternative
 // parser/optimizer/codegen, e.g the SSR optimizing compiler.
 // Here we just export a default compiler using the default parts.
 var createCompiler = createCompilerCreator(function baseCompile (
   template,
   options
 ) {
   var ast = parse(template.trim(), options);
   optimize(ast, options);
   var code = generate(ast, options);
   return {
     ast: ast,
     render: code.render,
     staticRenderFns: code.staticRenderFns
   }
 });
 
 /*  */
 
 var ref$1 = createCompiler(baseOptions);
 var compileToFunctions = ref$1.compileToFunctions;
 
 /*  */
 
 var idToTemplate = cached(function (id) {
   var el = query(id);
   return el && el.innerHTML
 });
 
 var mount = Vue$3.prototype.$mount;
 Vue$3.prototype.$mount = function (
   el,
   hydrating
 ) {
   el = el && query(el);
 
   /* istanbul ignore if */
   if (el === document.body || el === document.documentElement) {
     "development" !== 'production' && warn(
       "Do not mount Vue to <html> or <body> - mount to normal elements instead."
     );
     return this
   }
 
   var options = this.$options;
   // resolve template/el and convert to render function
   if (!options.render) {
     var template = options.template;
     if (template) {
       if (typeof template === 'string') {
         if (template.charAt(0) === '#') {
           template = idToTemplate(template);
           /* istanbul ignore if */
           if ("development" !== 'production' && !template) {
             warn(
               ("Template element not found or is empty: " + (options.template)),
               this
             );
           }
         }
       } else if (template.nodeType) {
         template = template.innerHTML;
       } else {
         {
           warn('invalid template option:' + template, this);
         }
         return this
       }
     } else if (el) {
       template = getOuterHTML(el);
     }
     if (template) {
       /* istanbul ignore if */
       if ("development" !== 'production' && config.performance && mark) {
         mark('compile');
       }
 
       var ref = compileToFunctions(template, {
         shouldDecodeNewlines: shouldDecodeNewlines,
         delimiters: options.delimiters,
         comments: options.comments
       }, this);
       var render = ref.render;
       var staticRenderFns = ref.staticRenderFns;
       options.render = render;
       options.staticRenderFns = staticRenderFns;
 
       /* istanbul ignore if */
       if ("development" !== 'production' && config.performance && mark) {
         mark('compile end');
         measure(((this._name) + " compile"), 'compile', 'compile end');
       }
     }
   }
   return mount.call(this, el, hydrating)
 };
 
 /**
  * Get outerHTML of elements, taking care
  * of SVG elements in IE as well.
  */
 function getOuterHTML (el) {
   if (el.outerHTML) {
     return el.outerHTML
   } else {
     var container = document.createElement('div');
     container.appendChild(el.cloneNode(true));
     return container.innerHTML
   }
 }
 
 Vue$3.compile = compileToFunctions;
 
 return Vue$3;
 
 })));